fgmeta/download_and_compile.sh

#!/bin/bash
#* Written by Francesco Angelo Brisa, started January 2008.
#
# Copyright (C) 2013 Francesco Angelo Brisa
# email: fbrisa@gmail.com   -   fbrisa@yahoo.it
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

CURRENT_LTS_BRANCH="release/2020.3"
OLD_LTS_BRANCH="release/2018.3"

script_blob_id='$Id$'
# Slightly tricky substitution to avoid our regexp being wildly replaced with
# the blob name (id) when the script is checked out:
#
# First extract the hexadecimal blob object name followed by a '$'
VERSION="$(echo "$script_blob_id" | sed 's@\$Id: *\([0-9a-f]\+\) *@\1@')"
# Then remove the trailing '$'
VERSION="${VERSION%\$}"

PROGNAME=$(basename "$0")

#######################################################
# THANKS TO
#######################################################
# Special thanks to Alessandro Garosi for FGComGui and
# other patches
# Thanks to "Pat Callahan" for patches for fgrun compilation
# Thanks to "F-JJTH" for bug fixes and suggestions
# Thanks again to "F-JJTH" for OpenRTI and FGX
# Thanks to André, (taureau89_9) for debian stable packages fixes

#############################################################"
# Some helper functions for redundant tasks

# Return 0 if $1 is identical to one of $2, $3, etc., else return 1.
_elementIn(){
  local valueToCheck="$1"
  local e

  shift
  for e; do
    if [ "$e" = "$valueToCheck" ]; then
      return 0
    fi
  done

  return 1
}

# Print $2, $3, ... using $1 as separator.
# From <https://stackoverflow.com/questions/1527049/how-can-i-join-elements-of-an-array-in-bash>
function _joinBy(){
  local d="$1"; shift
  echo -n "$1"; shift
  printf "%s" "${@/#/$d}"
}

function _log(){
  echo "$@" >> "$LOGFILE"
}

function _logSep(){
  _log \
 "******************************************************************************"
}

function _printLog(){
  # Possible special case for the terminal: echo "${PROGNAME}: $@"
  # That would be more precise but rather verbose, and not all output uses
  # _printLog() for now, so it would look too inconsistent.
  echo "$@" | tee -a "$LOGFILE"
}

# Echo the contents of stdin to the terminal and/or to $LOGFILE.
function _logOutput(){
  case "$1" in
    term)
      cat ;;
    file)
      cat >> "$LOGFILE" ;;
    ""|term+file)
      tee -a "$LOGFILE" ;;
    *)
      _printLog "Bug in ${PROGNAME}: unexpected value for the first parameter" \
                "of _logOutput(): '$1'"
      exit 1 ;;
  esac
}

# Return code is 0 for 'yes' and 1 for 'no'.
function _yes_no_prompt(){
  local prompt="$1"
  local default="$2"
  local choices res answer

  case "$default" in
    [yY]) choices='Y/n' ;;
    [nN]) choices='y/N' ;;
    "")
      if [[ "$INTERACTIVE_MODE" -eq 0 ]]; then
        _printLog "Non-interactive mode requested, but found a question with" \
                  "no default answer;"
        _printLog "this can't work, aborting."
        exit 1
      fi
      choices='y/n'
      ;;
    *)
      _printLog \
        "Invalid default choice for _yes_no_prompt(): this is a bug in the"
        "script, aborting."
      exit 1
      ;;
  esac

  while true; do
    if [[ "$INTERACTIVE_MODE" -eq 0 ]]; then
      answer="$default"
    else
      read -r -p "$prompt [$choices] " answer
    fi

    if [[ -z "$answer" ]]; then
      answer="$default"
    fi

    case "$answer" in
      [yY]) res=0; break ;;
      [nN]) res=1; break ;;
      *) ;;
    esac
  done

  return $res
}

# Return code is 0 for 'yes', 1 for 'no' and 2 for 'quit'.
function _yes_no_quit_prompt(){
  local prompt="$1"
  local default="$2"
  local choices res answer

  case "$default" in
    [yY]) choices='Y/n/q' ;;
    [nN]) choices='y/N/q' ;;
    [qQ]) choices='y/n/Q' ;;
    "")
      if [[ "$INTERACTIVE_MODE" -eq 0 ]]; then
        _printLog "Non-interactive mode requested, but found a question with" \
                  "no default answer;"
        _printLog "this can't work, aborting."
        exit 1
      fi
      choices='y/n/q'
      ;;
    *)
      _printLog \
        "Invalid default choice for _yes_no_quit_prompt(): this is a bug in the"
        "script, aborting."
      exit 1
      ;;
  esac

  while true; do
    if [[ "$INTERACTIVE_MODE" -eq 0 ]]; then
      answer="$default"
    else
      read -r -p "$prompt [$choices] " answer
    fi

    if [[ -z "$answer" ]]; then
      answer="$default"
    fi

    case "$answer" in
      [yY]) res=0; break ;;
      [nN]) res=1; break ;;
      [qQ]) res=2; break ;;
      *) ;;
    esac
  done

  return $res
}

# Recursively delete build and install directories, but preserve FGData if
# present.
function _cleanup(){
  if [[ -z "$CBD" || -z "$INSTALL_DIR" || -z "$INSTALL_DIR_FGFS" ]]; then
    _printLog "${PROGNAME}:" '_cleanup() called while $CBD or $INSTALL_DIR or'
    _printLog '$INSTALL_DIR_FGFS is empty.'
    _printLog "\$CBD='$CBD'"
    _printLog "\$INSTALL_DIR='$INSTALL_DIR'"
    _printLog "\$INSTALL_DIR_FGFS='$INSTALL_DIR_FGFS'"
    _printLog 'This is unexpected; please report.'
    exit 1
  fi

  local fgdata_backup="$CBD/fgdata.tmp.download_and_compile-cleanup"
  local -i fgdata_moved=0

  _printLog "Deleting build directories ($CBD/build)..."
  rm -rf "$CBD/build"

  if [[ -d "$INSTALL_DIR_FGFS/fgdata" ]]; then
    _printLog "Moving FGData to $fgdata_backup..."
    mv "$INSTALL_DIR_FGFS/fgdata" "$fgdata_backup"
    fgdata_moved=1
  fi

  if [[ "$(basename "$INSTALL_DIR")" -eq "install" ]]; then
    _printLog "Deleting install directories ($INSTALL_DIR)..."
    rm -rf "$INSTALL_DIR"
  else
    _printLog "${PROGNAME}: unexpected value for \$INSTALL_DIR: '$INSTALL_DIR'."
    _printLog "Refusing to recursively delete it. Aborting; please report."
    exit 1
  fi

  if [[ $fgdata_moved -eq 1 ]]; then
    mkdir -p "$INSTALL_DIR_FGFS"
    _printLog "Moving FGData back to $INSTALL_DIR_FGFS/fgdata..."
    mv "$fgdata_backup" "$INSTALL_DIR_FGFS/fgdata"
  fi

  _printLog
}

function _aptUpdate(){
  local cmd=()

  if [[ -n "$SUDO" ]]; then
    cmd+=("$SUDO")
  fi

  cmd+=("$PKG_MGR" "update")

  _printLog "Running '${cmd[*]}'..."
  "${cmd[@]}"
}

function _aptInstall(){
  local cmd=()

  if [[ -n "$SUDO" ]]; then
    cmd+=("$SUDO")
  fi

  cmd+=("$PKG_MGR" "install" "$@")

  _printLog "Running '${cmd[*]}'..."
  "${cmd[@]}"
}

function _gitUpdate(){
  if [ "$DOWNLOAD" != "y" ]; then
    return
  fi

  local branch="$1"
  set +e
  git diff --exit-code 2>&1 > /dev/null
  if [[ $? != 1 ]]; then
    set -e
    git fetch origin
    git checkout --force "$branch"
    git pull --rebase
  else
    set -e
    git fetch origin
    git stash save --include-untracked --quiet
    git checkout --force "$branch"
    git pull --rebase
    git stash pop --quiet
  fi
}

function _gitProtoSpec(){
 local proto="$1"
 local username="$2"
 local component="$3"
 local complement

 case "$proto" in
   ssh)
     if [[ -z "$username" ]]; then
       if [[ -n "$component" ]]; then
         complement=" (used to retrieve component $component)"
       fi

       _printLog "Protocol ssh$complement requires a username,"
       _printLog "but none was specified! Aborting."
       exit 1
     fi
     echo "${proto}://${username}@"
     ;;
   https|git)
     echo "${proto}://"
     ;;
   *)
     _printLog "Unknown protocol in _gitProtoSpec(): '$proto'. Aborting."
     exit 1
     ;;
 esac
}

function _gitDownload(){
  local component="$1"
  local clone_arg

  if [[ "$DOWNLOAD" != "y" ]]; then
    return
  fi

  if [[ -d ".git" ]]; then
    _printLog "$component: the repository already exists"
  else
    proto_spec=$(_gitProtoSpec "${REPO_PROTO[$component]}" \
                               "${REPO_USERNAME[$component]}" \
                               "$component")
    clone_arg="${proto_spec}${REPO_ADDRESS[$component]}"

    # Test whether $clone_arg is 'https://git.code.sf.net/p/flightgear/fgdata'
    if _check_clone_url_and_maybe_ask "$clone_arg"; then
      _clone_fgdata             # Work around a problem at SourceForge
    else
      _printLog "Fetching $component with 'git clone $clone_arg'"
      git clone "$clone_arg" .
    fi
  fi
}

# Return 0 if _clone_fgdata() should be used, otherwise 1.
function _check_clone_url_and_maybe_ask(){
  local -i retcode=1

  if [[ "$1" = "https://git.code.sf.net/p/flightgear/fgdata" ]]; then
    local prompt_res=-1
    set +e
    if [[ "$INTERACTIVE_MODE" -eq 1 ]]; then
      printf "From experience, cloning FGData from SourceForge using https does \
not work\n(probably a problem at SourceForge), but updates do work. Thus, we \
propose to\nclone FGData from GitLab and change the repository setup so that \
subsequent\nupdates are fetched from SourceForge. This should be quite safe, \
because\n<https://gitlab.com/flightgear/fgdata> is an official mirror of \
FGData (it is\nmaintained by FlightGear developers). Answer 'y' to proceed \
this way. If you\nanswer 'n', we'll *try* to clone FGData from SourceForge \
using https. Answer 'q'\nif you want to quit. "
    fi
    _yes_no_quit_prompt "What is your choice?" y; prompt_res=$?
    set -e
    case $prompt_res in
        0) retcode=0 ;;
        1) retcode=1 ;;
        2) exit 0 ;;
        *) _printLog "Unexpected return code from _yes_no_quit_prompt() in" \
                     "_check_clone_url_and_maybe_ask(); aborting."
           exit 1 ;;
    esac

    if [[ $retcode -eq 1 ]]; then
      _printLog "Okay, will try to clone FGData from SourceForge using" \
        "https, but be aware that"
      _printLog "this is likely to fail."
    fi
  fi

  return $retcode
}

# Special function for cloning FGData with https. This is needed because there
# seems to be a problem at SourceForge that doesn't allow the clone operation
# to succeed for FGData using https---presumably because of its large size.
function _clone_fgdata(){
  local url="https://${REPO_ADDRESS[DATA_ALT]}"
  _printLog "Starting special initialization routine for the DATA component..."
  _printLog "Fetching FGData with 'git clone $url'"
  git clone "$url" .
  _printLog "Creating the 'next' local branch"
  git checkout -b next origin/next
  url="https://${REPO_ADDRESS[DATA]}"
  _printLog "Setting FGData's 'origin' remote to $url"
  git remote set-url origin "$url"
  _printLog "Updating FGData from $url"
  git pull --ff-only
  _printLog "Special initialization routine for the DATA component: done."
}

function _make(){
  if [ "$COMPILE" = "y" ]; then
    pkg="$1"
    cd "$CBD/build/$pkg"
    _printLog "MAKE $pkg"
    make $JOPTION $OOPTION 2>&1 | _logOutput
    _printLog "INSTALL $pkg"
    make install 2>&1 | _logOutput
  fi
}

# Add an available, non-virtual package matching one of the given regexps.
#
# Each positional parameter is interpreted as a POSIX extended regular
# expression. These parameters are examined from left to right, and the first
# available matching package is added to the global PKG variable. If no match
# is found, the script aborts.
function _mandatory_pkg_alternative(){
  local pkg

  if [[ $# -lt 1 ]]; then
    _printLog \
      "Empty package alternative: this is a bug in the script, aborting."
    exit 1
  fi

  _printLog "Considering a package alternative: $*"
  pkg=$(_find_package_alternative "$@")

  if [[ -n "$pkg" ]]; then
    _printLog "Package alternative matched for $pkg"
    PKG+=("$pkg")
  else
    _printLog "No match found for the package alternative, aborting."
    exit 1
  fi

  return 0
}

# If available, add a non-virtual package matching one of the given regexps.
#
# Returning 0 or 1 on success to indicate whether a match was found could be
# done, but would need to be specifically handled at the calling site,
# since the script is run under 'set -e' regime.
function _optional_pkg_alternative(){
  local pkg

  if [[ $# -lt 1 ]]; then
    _printLog "Empty optional package alternative: this is a bug in the" \
              "script, aborting."
    exit 1
  fi

  _printLog "Considering an optional package alternative: $*"
  pkg=$(_find_package_alternative "$@")

  if [[ -n "$pkg" ]]; then
    _printLog "Optional package alternative matched for $pkg"
    PKG+=("$pkg")
  else
    _printLog "No match found for the optional package alternative," \
              "continuing anyway."
    # "$*" so that we only add one element to the array in this line
    UNMATCHED_OPTIONAL_PKG_ALTERNATIVES+=("$*")
  fi

  return 0
}

# This function requires the 'dctrl-tools' package
function _find_package_alternative(){
  local pkg

  if [[ $# -lt 1 ]]; then
    return 0                    # Nothing could be found
  fi

  # This finds non-virtual packages only (on purpose)
  pkg="$(apt-cache dumpavail | \
         grep-dctrl -e -sPackage -FPackage \
           "^[[:space:]]*($1)[[:space:]]*\$" - | \
         sed -ne '1s/^Package:[[:space:]]*//gp')"

  if [[ -n "$pkg" ]]; then
    echo "$pkg"
    return 0
  else
    # Try with the next regexp
    shift
    _find_package_alternative "$@"
  fi
}

# If component $1 is in WHATTOBUILD, add components $2, $3, etc., to
# WHATTOBUILD unless they are already there.
function _depends(){
  local component="$1"
  shift

  if _elementIn "$component" "${WHATTOBUILD[@]}"; then
    for dependency in "$@"; do
       if ! _elementIn "$dependency" "${WHATTOBUILD[@]}"; then
         _printLog "$component: adding depended-on component $dependency"
         WHATTOBUILD+=("$dependency")
         nb_added_intercomponent_deps=$((nb_added_intercomponent_deps + 1))
       fi
    done
  fi
}

function _maybe_add_intercomponent_deps(){
  local comp_word

  if [[ "$IGNORE_INTERCOMPONENT_DEPS" = "y" ]]; then
    return 0
  fi

  # FlightGear requires SimGear
  _depends FGFS SIMGEAR
  # TerraGear requires SimGear
  _depends TERRAGEAR SIMGEAR

  # Print a helpful message if some components were automatically added
  if (( nb_added_intercomponent_deps > 0 )); then
    if (( nb_added_intercomponent_deps > 1 )); then
      comp_word='components'
    else
      comp_word='component'
    fi
    _printLog "$PROGNAME: automatically added $nb_added_intercomponent_deps" \
              "$comp_word based on"
    _printLog "intercomponent dependencies. Use option" \
              "--ignore-intercomponent-deps if you"
    _printLog "want to disable this behavior."
    _printLog
  fi
}

# Component dependencies on distribution packages
function _installOrUpdateDistroPackages(){
  if [[ "$DOWNLOAD_PACKAGES" = "n" ]]; then
    _printLog
    _printLog "Note: option -p of $PROGNAME set to 'n' (no), therefore no"
    _printLog "      package will be installed via ${PKG_MGR}. Compilation of" \
                    "some components"
    _printLog "      may fail if mandatory dependencies are missing."
    return 0
  fi

  if [[ "$APT_GET_UPDATE" = "y" ]]; then
    _aptUpdate
  fi

  # Ensure 'dctrl-tools' is installed
  if [[ "$(dpkg-query --showformat='${Status}\n' --show dctrl-tools \
                      2>/dev/null | awk '{print $3}')" != "installed" ]]; then
    _aptInstall dctrl-tools
  fi

  # Minimum
  PKG=(build-essential git)
  _mandatory_pkg_alternative libcurl4-openssl-dev libcurl4-gnutls-dev

  # CMake
  if _elementIn "CMAKE" "${WHATTOBUILD[@]}"; then
    PKG+=(libarchive-dev libbz2-dev libexpat1-dev libjsoncpp-dev liblzma-dev
          libncurses5-dev libssl-dev procps zlib1g-dev)
  else
    PKG+=(cmake)
  fi

  # TerraGear
  if _elementIn "TERRAGEAR" "${WHATTOBUILD[@]}"; then
    PKG+=(libboost-dev libcgal-dev libgdal-dev libtiff5-dev zlib1g-dev)
  fi

  # TerraGear GUI and OpenRTI
  if _elementIn "TERRAGEARGUI" "${WHATTOBUILD[@]}" || \
     _elementIn "OPENRTI" "${WHATTOBUILD[@]}"; then
    PKG+=(libqt4-dev)
  fi

  # SimGear and FlightGear
  if _elementIn "SIMGEAR" "${WHATTOBUILD[@]}" || \
     _elementIn "FGFS" "${WHATTOBUILD[@]}"; then
    PKG+=(zlib1g-dev freeglut3-dev libglew-dev libopenal-dev libboost-dev \
          liblzma-dev)

    if ! _elementIn "OSG" "${WHATTOBUILD[@]}"; then
      _mandatory_pkg_alternative libopenscenegraph-3.4-dev \
        libopenscenegraph-dev 'libopenscenegraph-[0-9]+\.[0-9]+-dev'
    fi
  fi

  # FlightGear
  if _elementIn "FGFS" "${WHATTOBUILD[@]}"; then
    PKG+=(libudev-dev libdbus-1-dev)
    if ! _elementIn "PLIB" "${WHATTOBUILD[@]}"; then
      PKG+=(libplib-dev)
    fi
    _mandatory_pkg_alternative libpng-dev libpng12-dev libpng16-dev
    # The following packages are needed for the built-in launcher
    _optional_pkg_alternative qt5-default qtchooser
    _optional_pkg_alternative qtdeclarative5-dev
    _optional_pkg_alternative qttools5-dev
    _optional_pkg_alternative qtbase5-dev-tools            # for rcc
    _optional_pkg_alternative qttools5-dev-tools           # for lrelease
    _optional_pkg_alternative qml-module-qtquick2
    _optional_pkg_alternative qml-module-qtquick-window2
    _optional_pkg_alternative qml-module-qtquick-dialogs

    if [[ "$SELECTED_SUITE" != "old-lts" ]]; then
        _optional_pkg_alternative qml-module-qtquick-controls2
    fi

    _optional_pkg_alternative libqt5opengl5-dev
    _optional_pkg_alternative libqt5svg5-dev
    _optional_pkg_alternative libqt5websockets5-dev
    # The following packages are only needed for the Qt-based remote Canvas
    # (comment written at the time of FG 2018.2).
    _optional_pkg_alternative qtbase5-private-dev
    _optional_pkg_alternative qtdeclarative5-private-dev
    # FGPanel
    PKG+=(fluid libbz2-dev libfltk1.3-dev libxi-dev libxmu-dev)
    # FGAdmin
    PKG+=(libxinerama-dev libjpeg-dev libxft-dev)
    # swift
    _optional_pkg_alternative libevent-dev
  fi

  # ATC-pie
  if _elementIn "ATCPIE" "${WHATTOBUILD[@]}"; then
    PKG+=(python3-pyqt5 python3-pyqt5.qtmultimedia libqt5multimedia5-plugins)
  fi

  # FGo!
  if _elementIn "FGO" "${WHATTOBUILD[@]}"; then
    PKG+=(python-tk)
  fi

  # if _elementIn "FGX" "${WHATTOBUILD[@]}"; then
  #   FGx (FGx is not compatible with Qt5, however we have installed Qt5 by
  #   default)
  #   PKG+=(libqt5xmlpatterns5-dev libqt5webkit5-dev)
  # fi

  _aptInstall "${PKG[@]}"
}

function _describeSelectedSuite(){
  local prompt_res

  _printLog "$SUITE_DESCRIPTION"
  _printLog
  _printLog "\
Note that options '-s', '--lts' and '--old-lts' apply in particular to the
SIMGEAR, FGFS and DATA components, but other components may be affected as
well. Use '--component-branch COMPONENT=BRANCH' (without the quotes) if you
want to override the defaults (i.e., manually choose the branches for
particular components)."

  # Make sure users building 'next' are aware of the possible consequences. :-)
  if [[ "$SELECTED_SUITE" = "next" && \
        $logfile_was_already_present_when_starting -eq 0 ]]; then
    set +e
    _printLog
    _yes_no_prompt "Are you sure you want to continue?" y; prompt_res=$?
    set -e
    if [[ $prompt_res -eq 1 ]]; then
      _printLog "Aborting as requested."
      exit 0
    fi
  fi
}

function _determineSuiteDescriptionAndBranchForEachComponent(){
  local FG_BRANCH

  case "$SELECTED_SUITE" in
    next)
      FG_BRANCH=next
      COMPONENT_BRANCH[OPENRTI]=master
      COMPONENT_BRANCH[OSG]=OpenSceneGraph-3.6
      COMPONENT_BRANCH[TERRAGEAR]=next
      SUITE_DESCRIPTION="\
!! You have selected the 'next' suite, which contains the development version
   of FlightGear. The corresponding FlightGear code is very recent but may
   well be unstable. Other possibilities are '--lts' for the 'LTS' suite (Long
   Term Stable), '--old-lts' for the previous LTS suite and '-s' for the
   latest release. '--lts' should provide the most stable setup. !!"
      ;;
    latest-release)
      FG_BRANCH="release/$(git ls-remote --heads "https://${REPO_ADDRESS[FGFS]}" | grep '\/release\/' | cut -f4 -d'/' | sort -t . -k 1,1n -k2,2n -k3,3n | tail -1)"
      COMPONENT_BRANCH[OPENRTI]=release-0.7
      COMPONENT_BRANCH[OSG]=OpenSceneGraph-3.4
      COMPONENT_BRANCH[TERRAGEAR]=scenery/ws2.0
      SUITE_DESCRIPTION="\
You have selected the latest release of FlightGear. This is supposedly less
stable than '--lts' (Long Term Stable) but more stable than the development
version (which would be obtained with none of '-s', '--lts' and '--old-lts')."
      ;;
    latest-lts)
      FG_BRANCH="$CURRENT_LTS_BRANCH"
      COMPONENT_BRANCH[OPENRTI]=release-0.7
      COMPONENT_BRANCH[OSG]=OpenSceneGraph-3.4
      COMPONENT_BRANCH[TERRAGEAR]=scenery/ws2.0
      SUITE_DESCRIPTION="\
You have selected the LTS suite (Long Term Stable). This is in principle the
most stable setup. Other possibilities are '--old-lts' for the previous LTS
suite, '-s' for the latest release and nothing (none of '-s', '--lts' and
'--old-lts' passed) for bleeding-edge development versions."
      ;;
    old-lts)
      FG_BRANCH="$OLD_LTS_BRANCH"
      COMPONENT_BRANCH[OPENRTI]=release-0.7
      COMPONENT_BRANCH[OSG]=OpenSceneGraph-3.4
      COMPONENT_BRANCH[TERRAGEAR]=scenery/ws2.0
      SUITE_DESCRIPTION="\
You have selected the old LTS suite (previous Long Term Stable). Other
possibilities are '--lts' for the current LTS suite, '-s' for the latest
release and nothing (none of '-s', '--lts' and '--old-lts' passed) for
bleeding-edge development versions. If you are in doubt and just want
something stable for flying or aircraft development, our suggestion is to use
'--lts'."
      ;;
    *) _printLog "Unexpected value '$SELECTED_SUITE' for SELECTED_SUITE; " \
                 "please report a bug."
      exit 1
      ;;
  esac

  COMPONENT_BRANCH[PLIB]=master
  COMPONENT_BRANCH[CMAKE]=release
  COMPONENT_BRANCH[SIMGEAR]="$FG_BRANCH"
  COMPONENT_BRANCH[FGFS]="$FG_BRANCH"
  COMPONENT_BRANCH[DATA]="$FG_BRANCH"
  COMPONENT_BRANCH[FGRUN]=next
  COMPONENT_BRANCH[FGO]=1.5.5
  COMPONENT_BRANCH[FGX]=master
  COMPONENT_BRANCH[OPENRADAR]=OpenRadar.zip
  COMPONENT_BRANCH[ATCPIE]=master
  COMPONENT_BRANCH[TERRAGEARGUI]=master
  COMPONENT_BRANCH[ZLIB]=master

  for component in "${!COMPONENT_BRANCH_OVERRIDES[@]}"; do
    COMPONENT_BRANCH[$component]="${COMPONENT_BRANCH_OVERRIDES[$component]}"
  done
}

function _determineProtocolAndUsernameForEachComponentRepository(){
  local site

  for component in "${WHATTOBUILD_AVAIL[@]}"; do
    # First use the default download settings for each repository
    REPO_PROTO[$component]="$REPO_DEFAULT_PROTO"
    REPO_USERNAME[$component]="$REPO_DEFAULT_USERNAME"

    site="${REPO_SITE[$component]}"
    site="${site,,}"              # convert to lowercase

    # Is there a specific protocol for this repo's hosting site?
    if [[ -n "$site" && -n "${PROTO_AT_SITE[$site]}" ]]; then
      REPO_PROTO[$component]="${PROTO_AT_SITE[$site]}"
    fi

    # Is there a specific username for this repo's hosting site?
    if [[ -n "$site" && -n "${USERNAME_AT_SITE[$site]}" ]]; then
      REPO_USERNAME[$component]="${USERNAME_AT_SITE[$site]}"
    fi
  done
}

function _displayGeneralAdvice(){
  echo '**********************************************************************'
  echo '*                                                                    *'
  echo '* Warning: a typical SimGear + FlightGear + FGData build requires    *'
  echo '* about 12 GiB of disk space. The compilation part may last from a   *'
  echo '* few minutes to hours, depending on your computer.                  *'
  echo '*                                                                    *'
  echo '* Hint: use the -j option if your CPU has several cores, as in:      *'
  echo '*                                                                    *'
  echo '*         download_and_compile.sh -j$(nproc)                         *'
  echo '*                                                                    *'
  echo '**********************************************************************'
  echo
}

# $1: command line used to start the script
function _startLog(){
  echo "$1" > "$LOGFILE"
  _log "VERSION=$VERSION"
  _log "SELECTED_SUITE=$SELECTED_SUITE"
  _log "APT_GET_UPDATE=$APT_GET_UPDATE"
  _log "DOWNLOAD_PACKAGES=$DOWNLOAD_PACKAGES"
  _log "IGNORE_INTERCOMPONENT_DEPS=$IGNORE_INTERCOMPONENT_DEPS"
  _log "COMPILE=$COMPILE"
  _log "RECONFIGURE=$RECONFIGURE"
  _log "DOWNLOAD=$DOWNLOAD"
  _log "JOPTION=$JOPTION"
  _log "OOPTION=$OOPTION"
  _log "BUILD_TYPE=$BUILD_TYPE"
  _log "SG_CMAKEARGS=${SG_CMAKE_ARGS[@]}"
  _log "FG_CMAKEARGS=${FG_CMAKE_ARGS[@]}"
  _log "COMPOSITOR=$COMPOSITOR"
  _log "DIRECTORY=$CBD"
  _log
}

function _showBranchForEachComponent(){
  _printLog
  _printLog "Branch used for each component:"
  _printLog
  # This method guarantees a stable order for the output
  for component in "${WHATTOBUILD_AVAIL[@]}"; do
    if _elementIn "$component" "${WHATTOBUILD[@]}"; then
      _printLog "  COMPONENT_BRANCH[$component]=${COMPONENT_BRANCH[$component]}"
    fi
  done

  _log
}

function _printVersion(){
  echo "$PROGNAME version $VERSION"
  echo
  echo "This script is part of the FlightGear project."
  echo
  echo "This program is free software: you can redistribute it and/or modify"
  echo "it under the terms of the GNU General Public License as published by"
  echo "the Free Software Foundation, either version 3 of the License, or"
  echo "(at your option) any later version."
  echo
  echo "This program is distributed in the hope that it will be useful,"
  echo "but WITHOUT ANY WARRANTY; without even the implied warranty of"
  echo "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the"
  echo "GNU General Public License for more details."
  echo
  echo "You should have received a copy of the GNU General Public License"
  echo "along with this program.  If not, see <http://www.gnu.org/licenses/>."
}

function _usage() {
  echo "$PROGNAME [OPTION...] [--] [COMPONENT...]"
  echo "Download and compile components belonging to the FlightGear ecosystem."
  echo
  echo "Without any COMPONENT listed, or if ALL is specified, recompile all"
  echo "components listed in the WHATTOBUILDALL variable. Each COMPONENT may"
  echo "be one of the following words:"
  echo
  echo "  ALL, $(_joinBy ', ' "${WHATTOBUILD_AVAIL[@]}")."
  echo
  echo "Available options:"
  echo "  -h, --help    show this help message and exit"
  echo "      --version print version and license information, then exit"
  echo "  -e            compile FlightGear with --with-eventinput option (experimental)"
  echo "  -i            compile SimGear and FlightGear with -D ENABLE_RTI=ON option (experimental)"
  echo "  -b RELEASE_TYPE                                                                     default=RelWithDebInfo"
  echo "                set build type to RELEASE_TYPE (Release|RelWithDebInfo|Debug)"
  echo "  -a y|n        y=run 'PACKAGE_MANAGER update', n=don't                               default=y"
  echo "                (PACKAGE_MANAGER being a program like 'apt-get', see below)"
  echo "  -p y|n        y=install packages using PACKAGE_MANAGER, n=don't                     default=y"
  echo "  -c y|n        y=compile programs, n=don't                                           default=y"
  echo "  -d y|n        y=fetch programs from the Internet (Git, svn, etc.), n=don't          default=y"
  echo "      --cleanup Remove all build and installation directories. Try this if a"
  echo '                compilation fails and the "base directory" was not "fresh" when'
  echo "                you started ${PROGNAME}. If this option is given and no"
  echo "                component has been specified on the command line, then only the"
  echo "                cleanup routine is run."
  echo "      --git-clone-default-proto=PROTO                                                 default=https"
  echo "                default protocol to use for 'git clone' (https, git or ssh)"
  echo "      --git-clone-site-params=SITE=PROTOCOL[:USERNAME]"
  echo "                use PROTOCOL as USERNAME when cloning a Git repository located"
  echo "                at SITE (sample sites: 'sourceforge', 'github'; valid"
  echo "                protocols: 'ssh', 'https', 'git'; USERNAME is required when"
  echo "                using 'ssh'). You may pass this option several times with"
  echo "                different sites."
  echo "      --package-manager=PACKAGE_MANAGER                                               default=apt-get"
  echo "                program used to install packages; must be compatible with"
  echo "                'apt-get' for the operations performed by $PROGNAME."
  echo "      --sudo=SUDO_PROGRAM                                                             default=sudo"
  echo "                program used to run PACKAGE_MANAGER with appropriate rights"
  echo "                (pass an empty value to run the package manager directly)."
  echo "                Passing 'echo' as the SUDO_PROGRAM can be useful to see what"
  echo "                would be done with the package manager without actually running"
  echo "                the commands."
  echo "  -j X          pass -jX to the Make program"
  echo "  -O X          pass -OX to the Make program"
  echo "  -r y|n        y=reconfigure programs before compiling them, n=don't reconfigure     default=y"
  echo "      --ignore-intercomponent-deps"
  echo "                Ignore dependencies between components (default: don't)."
  echo "                Example: TERRAGEAR depends on SIMGEAR. Passing the option can be"
  echo "                useful if you want to update, rebuild, etc. TERRAGEAR without"
  echo "                doing the same for SIMGEAR (e.g., if doing repeated TERRAGEAR"
  echo "                builds and you know your SIMGEAR is already fine and up-to-date)."
  echo "      --lts     compile the latest Long Term Stable release of FlightGear (and"
  echo "                corresponding versions for other components)"
  echo "      --old-lts compile the previous Long Term Stable release of FlightGear (and"
  echo "                corresponding versions for other components)"
  echo "  -s            compile the latest release of FlightGear (and corresponding"
  echo "                versions for other components)"
  echo "      --component-branch=COMPONENT=BRANCH"
  echo "                Override the default branch for COMPONENT. For the specified"
  echo "                component, this overrides the effect of options -s, --lts and --old-lts."
  echo "                This option may be given several times."
  echo "      --sg-cmake-arg=ARGUMENT"
  echo "                Pass ARGUMENT to CMake when building SimGear."
  echo "                This option may be given several times."
  echo "      --fg-cmake-arg=ARGUMENT"
  echo "                Pass ARGUMENT to CMake when building FlightGear."
  echo "                This option may be given several times."
  echo "      --compositor"
  echo "                build FlightGear with compositor enabled"
  echo "      --non-interactive"
  echo "                don't ask any question; always assume the default answer in"
  echo "                situations where a question would normally be asked."
  echo
  echo "More detailed information can be found on the FlightGear wiki:"
  echo ""
  echo "  http://wiki.flightgear.org/Scripted_Compilation_on_Linux_Debian/Ubuntu"
  echo ""
  echo "The wiki may sometimes be a bit outdated; if in doubt, consider this help text"
  echo "as the reference."
}

#######################################################
# set script to stop if an error occours
set -e

CBD="$PWD"
LOGFILE="$CBD/compilation_log.txt"
INTERACTIVE_MODE=1

declare -i logfile_was_already_present_when_starting=0
if [[ -f "$LOGFILE" ]]; then
  logfile_was_already_present_when_starting=1
fi

# Available values for WHATTOBUILD and WHATTOBUILDALL:
declare -a WHATTOBUILD_AVAIL=(
  'CMAKE' 'PLIB' 'OPENRTI' 'OSG' 'SIMGEAR' 'FGFS' 'DATA' 'FGRUN' 'FGO' 'FGX'
  'OPENRADAR' 'ATCPIE' 'TERRAGEAR' 'TERRAGEARGUI' 'ZLIB'
)
WHATTOBUILDALL=(SIMGEAR FGFS DATA)
SELECTED_SUITE=next
CLEANUP="n"
APT_GET_UPDATE="y"
DOWNLOAD_PACKAGES="y"
COMPILE="y"
RECONFIGURE="y"
DOWNLOAD="y"
IGNORE_INTERCOMPONENT_DEPS="n"

SUDO="sudo"
PKG_MGR="apt-get"

# Initial values: preserve compatibility with the previous interface
declare -a SG_CMAKE_ARGS=($SG_CMAKEARGS)
declare -a FG_CMAKE_ARGS=($FG_CMAKEARGS)

if [[ `uname` == 'OpenBSD' ]]; then
    APT_GET_UPDATE="n"
    DOWNLOAD_PACKAGES="n"
fi

# How to download Git repositories:
#
# - 'https' used to be fine, but is currently unreliable at SourceForge (esp.
#   for FGData, see
#   <https://forum.flightgear.org/viewtopic.php?f=20&t=33620&start=90>);
# - 'git' is insecure (no way to guarantee you are downloading what you expect
#   to be downloading);
# - 'ssh' is secure, but requires an account at SourceForge (may be created at
#   no cost, though).
#
# These are the default values but may be overridden via command-line options.
REPO_DEFAULT_PROTO='https'
REPO_DEFAULT_USERNAME=''

JOPTION=""
OOPTION=""
BUILD_TYPE="RelWithDebInfo"

# Non user-exposed variable used to decide whether to print a “helpful”
# message
declare -i nb_added_intercomponent_deps=0

declare -a UNMATCHED_OPTIONAL_PKG_ALTERNATIVES

# Will hold the per-repository download settings.
declare -A REPO_PROTO
declare -A REPO_USERNAME

# Allows one to set a default (username, protocol) combination for each hosting
# site (SouceForge, GitHub, GitLab, etc.) when cloning a new repository.
declare -A PROTO_AT_SITE
declare -A USERNAME_AT_SITE

# Most specific settings: per-repository (actually, one current assumes that
# there is at most one repository per component such as SIMGEAR, FGFS, DATA,
# etc.)
declare -A REPO_ADDRESS
declare -A REPO_SITE

REPO_ADDRESS[CMAKE]="gitlab.kitware.com/cmake/cmake.git"
REPO_SITE[CMAKE]="gitlab.kitware.com"
REPO_ADDRESS[ZLIB]="github.com/madler/zlib.git"
REPO_SITE[ZLIB]="GitHub"
REPO_ADDRESS[PLIB]="git.code.sf.net/p/libplib/code"
REPO_SITE[PLIB]="SourceForge"
REPO_ADDRESS[OPENRTI]="git.code.sf.net/p/openrti/OpenRTI"
REPO_SITE[OPENRTI]="SourceForge"
REPO_ADDRESS[OSG]="github.com/openscenegraph/osg.git"
REPO_SITE[OSG]="GitHub"
REPO_ADDRESS[SIMGEAR]="git.code.sf.net/p/flightgear/simgear"
REPO_SITE[SIMGEAR]="SourceForge"
REPO_ADDRESS[DATA]="git.code.sf.net/p/flightgear/fgdata"
REPO_SITE[DATA]="SourceForge"
# This is an official mirror of FGData
REPO_ADDRESS[DATA_ALT]="gitlab.com/flightgear/fgdata.git"
REPO_SITE[DATA_ALT]="GitLab"
REPO_ADDRESS[FGFS]="git.code.sf.net/p/flightgear/flightgear"
REPO_SITE[FGFS]="SourceForge"
REPO_ADDRESS[FGRUN]="git.code.sf.net/p/flightgear/fgrun"
REPO_SITE[FGRUN]="SourceForge"
REPO_ADDRESS[FGX]="github.com/fgx/fgx.git"
REPO_SITE[FGX]="GitHub"
REPO_ADDRESS[ATCPIE]="git.code.sf.net/p/atc-pie/code"
REPO_SITE[ATCPIE]="SourceForge"
REPO_ADDRESS[TERRAGEAR]="git.code.sf.net/p/flightgear/terragear"
REPO_SITE[TERRAGEAR]="SourceForge"
REPO_ADDRESS[TERRAGEARGUI]="git.code.sf.net/p/flightgear/fgscenery/terrageargui"
REPO_SITE[TERRAGEARGUI]="SourceForge"

# Allows one to choose the branch for each component instead of relying on the
# defaults.
declare -A COMPONENT_BRANCH_OVERRIDES

# getopt is from the util-linux package (in Debian). Contrary to bash's getopts
# built-in function, it allows one to define long options.
getopt=getopt
if [[ `uname` == 'OpenBSD' ]]; then
    getopt=gnugetopt
fi
TEMP=$($getopt -o '+shc:p:a:d:r:j:O:ib:' \
  --longoptions cleanup,git-clone-default-proto:,git-clone-site-params: \
  --longoptions package-manager:,sudo:,ignore-intercomponent-deps,compositor \
  --longoptions component-branch:,sg-cmake-arg:,fg-cmake-arg:,non-interactive \
  --longoptions lts,old-lts,help,version \
  -n "$PROGNAME" -- "$@")

case $? in
    0) : ;;
    1) _usage >&2; exit 1 ;;
    *) exit 1 ;;
esac

# Don't remove the quotes around $TEMP!
eval set -- "$TEMP"

while true; do
  case "$1" in
    -s) SELECTED_SUITE=latest-release; shift ;;
    --lts) SELECTED_SUITE=latest-lts; shift ;;
    --old-lts) SELECTED_SUITE=old-lts; shift ;;
    --component-branch)
      if [[ "$2" =~ ^([-_a-zA-Z0-9]+)=(.+)$ ]]; then
        verbatim_component="${BASH_REMATCH[1]}"
        component="${BASH_REMATCH[1]^^}" # convert the component to uppercase
        branch="${BASH_REMATCH[2]}"

        if ! _elementIn "$component" "${WHATTOBUILD_AVAIL[@]}"; then
          echo "Invalid component passed to option --component-branch:" \
               "'$verbatim_component'. Allowed" >&2
          printf "components are:\n\n" >&2
          echo "  $(_joinBy ', ' "${WHATTOBUILD_AVAIL[@]}")." >&2
          exit 1
        fi

        COMPONENT_BRANCH_OVERRIDES["$component"]="$branch"
        unset -v verbatim_component component branch
      else
        echo "Invalid value passed to option --component-branch: '$2'." >&2
        echo "The correct syntax is" \
             "--component-branch COMPONENT=BRANCH" >&2
        echo "(or equivalently, --component-branch=COMPONENT=BRANCH)." >&2
        exit 1
      fi

      shift 2
      ;;
    --sg-cmake-arg)
      SG_CMAKE_ARGS+=("$2"); shift 2 ;;
    --fg-cmake-arg)
      FG_CMAKE_ARGS+=("$2"); shift 2 ;;
    -a) APT_GET_UPDATE="$2"; shift 2 ;;
    -c) COMPILE="$2"; shift 2 ;;
    -p) DOWNLOAD_PACKAGES="$2"; shift 2 ;;
    -d) DOWNLOAD="$2"; shift 2 ;;
    --cleanup) CLEANUP="y"; shift ;;
    --git-clone-default-proto)
      proto="${2,,}"            # convert to lowercase

      if ! _elementIn "$proto" ssh https git; then
        echo "Invalid protocol passed to option" \
             "--git-clone-default-proto: '$2'." >&2
        echo "Allowed protocols are 'ssh', 'https' and 'git'." >&2
        exit 1
      fi

      REPO_DEFAULT_PROTO="$proto"
      unset -v proto
      shift 2
      ;;
    --git-clone-site-params)
      if [[ "$2" =~ ^([[:alnum:]]+)=([[:alpha:]]+)(:([-_.[:alnum:]]+))?$ ]]; then
        site="${BASH_REMATCH[1],,}"         # convert the site to lowercase
        verbatim_proto="${BASH_REMATCH[2]}"
        proto="${verbatim_proto,,}"         # ditto for the protocol
        username="${BASH_REMATCH[4]}"       # but take the username verbatim

        if ! _elementIn "$proto" ssh https git; then
          echo "Invalid protocol passed to option --git-clone-site-params:" \
               "'$verbatim_proto'." >&2
          echo "Allowed protocols are 'ssh', 'https' and 'git'." >&2
          exit 1
        fi

        PROTO_AT_SITE[$site]="$proto"
        if [[ -n "$username" ]]; then
          USERNAME_AT_SITE[$site]="$username"
        fi

        if [[ "$proto" == "ssh" && -z "$username" ]]; then
          echo "Invalid value passed to option --git-clone-site-params: '$2'" >&2
          echo "The 'ssh' protocol requires a username (use" >&2
          echo "--git-clone-site-params SITE=ssh:USERNAME)." >&2
          exit 1
        fi

        unset -v site proto verbatim_proto username
      else
        echo "Invalid value passed to option --git-clone-site-params: '$2'." >&2
        echo "The correct syntax is" \
             "--git-clone-site-params SITE=PROTOCOL[:USERNAME]" >&2
        echo "(or equivalently, --git-clone-site-params=SITE=PROTOCOL[:USERNAME])." >&2
        exit 1
      fi
      shift 2
      ;;
    --package-manager) PKG_MGR="$2"; shift 2 ;;
    --sudo) SUDO="$2"; shift 2 ;;
    --ignore-intercomponent-deps) IGNORE_INTERCOMPONENT_DEPS="y"; shift ;;
    -r) RECONFIGURE="$2"; shift 2 ;;
    -j) JOPTION=" -j$2"; shift 2 ;;
    -O) OOPTION=" -O$2"; shift 2 ;;
    -i) OPENRTI="OPENRTI"; shift ;;
    -b) BUILD_TYPE="$2"; shift 2 ;;
    --compositor) COMPOSITOR="-DENABLE_COMPOSITOR=ON"; shift ;;
    --non-interactive) INTERACTIVE_MODE=0; shift ;;
    -h|--help) _usage; exit 0 ;;
    --version) _printVersion; exit 0 ;;
    --) shift; break ;;
    *) echo "$PROGNAME: unexpected option '$1'; please report a bug." >&2
       exit 1 ;;
  esac
done

declare -a WHATTOBUILD=()

if [[ $# == 0 && "$CLEANUP" == "n" ]] || _elementIn ALL "$@"; then
  WHATTOBUILD=( "${WHATTOBUILDALL[@]}" )
else
  WHATTOBUILD=( "$@" )
fi

# Name of the branch to check out for each component, depending on whether any
# of the options -s, --lts and --old-lts has been provided (for some projects
# which don't use a VCS, we may abuse this variable and store something else
# than a branch name).
declare -A COMPONENT_BRANCH
_determineSuiteDescriptionAndBranchForEachComponent

if [[ "$OPENRTI" = "OPENRTI" ]]; then
  SG_CMAKE_ARGS+=("-DENABLE_RTI=ON")
  FG_CMAKE_ARGS+=("-DENABLE_RTI=ON")
  WHATTOBUILD+=("OPENRTI")
fi

_startLog "$0 $*"

# The following is skipped when only running the “cleanup” routine.
if [[ ${#WHATTOBUILD[@]} -gt 0 ]]; then
  # Warn about compilation time and size (idea from Jester); give a hint about
  # the -j option.
  _displayGeneralAdvice
  _determineProtocolAndUsernameForEachComponentRepository
  _maybe_add_intercomponent_deps  # this may add elements to WHATTOBUILD
  # Among other things, this asks “Are you sure you want to continue?” if the
  # user chose 'next', $LOGFILE wasn't present when the script was started and
  # the --non-interactive option wasn't specified.
  _describeSelectedSuite
  _showBranchForEachComponent
  _logSep
  _installOrUpdateDistroPackages
fi

#######################################################
#######################################################

SUB_INSTALL_DIR=install
FGFS_INSTALL_DIR=flightgear
INSTALL_DIR="$CBD/$SUB_INSTALL_DIR"
INSTALL_DIR_FGFS="$INSTALL_DIR/$FGFS_INSTALL_DIR"
cd "$CBD"
mkdir -p build install

#######################################################
# BACKWARD COMPATIBILITY WITH 1.9.14a
#######################################################

if [ -d "$CBD"/fgfs/flightgear ]; then
  _logSep
  _printLog "Move to the new folder structure"
  rm -rf OpenSceneGraph
  rm -rf plib
  rm -rf build
  rm -rf install/fgo
  rm -rf install/fgx
  rm -rf install/osg
  rm -rf install/plib
  rm -rf install/simgear
  rm -f *.log*
  rm -f run_*.sh
  mv openrti/openrti tmp && rm -rf openrti && mv tmp openrti
  mv fgfs/flightgear tmp && rm -rf fgfs && mv tmp flightgear
  mv simgear/simgear tmp && rm -rf simgear && mv tmp simgear
  mkdir -p install/flightgear && mv install/fgfs/fgdata install/flightgear/fgdata
  echo "Done"
fi

_printLog

if [[ "$CLEANUP" = "y" ]]; then
  _cleanup
fi

#######################################################
# cmake
#######################################################
CMAKE_INSTALL_DIR=cmake
INSTALL_DIR_CMAKE="$INSTALL_DIR/$CMAKE_INSTALL_DIR"
cd "$CBD"
if _elementIn "CMAKE" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "*************** CMAKE ******************"
  _printLog "****************************************"

  mkdir -p "cmake"
  cd "$CBD"/cmake
  _gitDownload CMAKE
  _gitUpdate "${COMPONENT_BRANCH[CMAKE]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/cmake
    _printLog "CONFIGURING CMake"
    cd "$CBD"/build/cmake
    ../../cmake/configure --prefix="$INSTALL_DIR_CMAKE" \
           2>&1 | _logOutput
  fi

  _make cmake
  CMAKE="$INSTALL_DIR_CMAKE/bin/cmake"
else
  if [ -x "$INSTALL_DIR_CMAKE/bin/cmake" ]; then
    CMAKE="$INSTALL_DIR_CMAKE/bin/cmake"
  else
    CMAKE=cmake
  fi
fi

#######################################################
# ZLIB
#######################################################
ZLIB_INSTALL_DIR=zlib
INSTALL_DIR_ZLIB="$INSTALL_DIR/$ZLIB_INSTALL_DIR"
cd "$CBD"
if _elementIn "ZLIB" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** ZLIB ******************"
  _printLog "****************************************"

  mkdir -p "zlib"
  cd "$CBD"/zlib
  _gitDownload ZLIB
  _gitUpdate "${COMPONENT_BRANCH[ZLIB]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/zlib
    _log "CONFIGURING zlib"
    cd "$CBD"/build/zlib
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_ZLIB" \
          ../../zlib 2>&1 | _logOutput
  fi

  _make zlib
fi

#######################################################
# PLIB
#######################################################
PLIB_INSTALL_DIR=plib
INSTALL_DIR_PLIB="$INSTALL_DIR/$PLIB_INSTALL_DIR"
cd "$CBD"
if _elementIn "PLIB" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** PLIB ******************"
  _printLog "****************************************"

  mkdir -p "plib"
  cd "$CBD"/plib
  _gitDownload PLIB
  _gitUpdate "${COMPONENT_BRANCH[PLIB]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/plib
    _log "CONFIGURING plib"
    cd "$CBD"/build/plib
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_PLIB" \
          ../../plib 2>&1 | _logOutput
  fi

  _make plib
fi

#######################################################
# OPENRTI
#######################################################
OPENRTI_INSTALL_DIR=openrti
INSTALL_DIR_OPENRTI="$INSTALL_DIR/$OPENRTI_INSTALL_DIR"
cd "$CBD"
if _elementIn "OPENRTI" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** OPENRTI ***************"
  _printLog "****************************************"

  mkdir -p "openrti"
  cd "$CBD"/openrti
  _gitDownload OPENRTI
  _gitUpdate "${COMPONENT_BRANCH[OPENRTI]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/openrti
    cd "$CBD"/build/openrti
    rm -f CMakeCache.txt
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_OPENRTI" \
          ../../openrti 2>&1 | _logOutput
  fi

  _make openrti
fi

#######################################################
# OpenSceneGraph
#######################################################
OSG_INSTALL_DIR=openscenegraph
INSTALL_DIR_OSG="$INSTALL_DIR/$OSG_INSTALL_DIR"
cd "$CBD"
if _elementIn "OSG" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** OSG *******************"
  _printLog "****************************************"

  mkdir -p "openscenegraph"
  cd "openscenegraph"
  _gitDownload OSG
  _gitUpdate "${COMPONENT_BRANCH[OSG]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/openscenegraph
    cd "$CBD"/build/openscenegraph
    rm -f CMakeCache.txt
    if [ "$BUILD_TYPE" = "Debug" ]; then
      OSG_BUILD_TYPE=Debug
    else
      OSG_BUILD_TYPE=Release
    fi
    "$CMAKE" -DCMAKE_BUILD_TYPE="$OSG_BUILD_TYPE" \
         -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_OSG" ../../openscenegraph \
         2>&1 | _logOutput
  fi

  _make openscenegraph
  #FIX FOR 64 BIT COMPILATION
  if [ -d "$INSTALL_DIR_OSG/lib64" ]; then
    if [ -L "$INSTALL_DIR_OSG/lib" ]; then
      echo "link already done"
    else
      ln -s "$INSTALL_DIR_OSG/lib64" "$INSTALL_DIR_OSG/lib"
    fi
  fi
fi

#######################################################
# SIMGEAR
#######################################################
SIMGEAR_INSTALL_DIR=simgear
INSTALL_DIR_SIMGEAR="$INSTALL_DIR/$SIMGEAR_INSTALL_DIR"
cd "$CBD"
if _elementIn "SIMGEAR" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** SIMGEAR ***************"
  _printLog "****************************************"

  mkdir -p "simgear"
  cd "$CBD"/simgear
  _gitDownload SIMGEAR
  _gitUpdate "${COMPONENT_BRANCH[SIMGEAR]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/simgear
    cd "$CBD"/build/simgear
    rm -f CMakeCache.txt
    extra=''
    if [[ `uname` == 'OpenBSD' ]]; then
        extra=-DZLIB_ROOT=$INSTALL_DIR_ZLIB
    fi
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_SIMGEAR" \
          -DCMAKE_PREFIX_PATH="$INSTALL_DIR_OSG;$INSTALL_DIR_OPENRTI" \
          $extra \
	  "${SG_CMAKE_ARGS[@]}" \
          ../../simgear 2>&1 | _logOutput
  fi

  _make simgear
fi

#######################################################
# FGFS
#######################################################
cd "$CBD"
if _elementIn "FGFS" "${WHATTOBUILD[@]}" || \
   _elementIn "DATA" "${WHATTOBUILD[@]}"; then
  mkdir -p "$INSTALL_DIR_FGFS"/fgdata
  cd "$INSTALL_DIR_FGFS"/fgdata

  if _elementIn "DATA" "${WHATTOBUILD[@]}"; then
    _printLog "****************************************"
    _printLog "**************** DATA ******************"
    _printLog "****************************************"

    _gitDownload DATA
    _gitUpdate "${COMPONENT_BRANCH[DATA]}"
  fi

  mkdir -p "$CBD"/flightgear
  cd "$CBD"/flightgear

  if _elementIn "FGFS" "${WHATTOBUILD[@]}"; then
    _printLog "****************************************"
    _printLog "************** FLIGHTGEAR **************"
    _printLog "****************************************"

    _gitDownload FGFS
    _gitUpdate "${COMPONENT_BRANCH[FGFS]}"

    if [ "$RECONFIGURE" = "y" ]; then
      cd "$CBD"
      mkdir -p build/flightgear
      cd "$CBD"/build/flightgear
      rm -f CMakeCache.txt
      extra=
      if [[ `uname` == 'OpenBSD' ]]; then
        extra="-DZLIB_ROOT=$INSTALL_DIR_ZLIB \
            -DENABLE_QT=OFF \
            -DENABLE_FGCOM=OFF \
            -DVERBOSE=1"
      fi
      "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
            $COMPOSITOR \
            -DENABLE_FLITE=ON \
            -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_FGFS" \
            -DCMAKE_PREFIX_PATH="$INSTALL_DIR_SIMGEAR;$INSTALL_DIR_OSG;$INSTALL_DIR_OPENRTI;$INSTALL_DIR_PLIB" \
            -DFG_DATA_DIR:PATH="$INSTALL_DIR_FGFS/fgdata" \
            -DTRANSLATIONS_SRC_DIR:PATH="$INSTALL_DIR_FGFS/fgdata/Translations" \
            $extra \
            "${FG_CMAKE_ARGS[@]}" \
            ../../flightgear 2>&1 | _logOutput
    fi

    if [[ `uname` == 'OpenBSD' ]]; then
      # _make will end up running fgrcc, which was built with our zlib, so we
      # need to set LD_LIBRARY_PATH, otherwise things will fail because the
      # system zlib is too old.
      LD_LIBRARY_PATH=$INSTALL_DIR_ZLIB/lib _make flightgear
    else
      _make flightgear
    fi
  fi
  cd "$CBD"

  paths="../../$SIMGEAR_INSTALL_DIR/lib:../../$OSG_INSTALL_DIR/lib:../../$OPENRTI_INSTALL_DIR/lib:../../$PLIB_INSTALL_DIR/lib"
  gdb="gdb"

  common=""
  common="${common}#!/bin/sh\n"
  common="${common}cd \"\$(dirname \"\$0\")\"\n"
  common="${common}cd '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin'\n"

  if [[ `uname` == 'OpenBSD' ]]; then
    # Force use of our zlib.
    paths="$paths:../../$ZLIB_INSTALL_DIR/lib"
    # OpenBSD's base gdb is too old; `pkg_add egdb` gives one that we can use.
    gdb="egdb"
    common="${common}ulimit -d 4194304\n"
  fi

  set_ld_library_path="export LD_LIBRARY_PATH='$paths'\"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}\""
  common="${common}${set_ld_library_path}\n"

  SCRIPT=run_fgfs.sh
  echo -en "$common" > $SCRIPT
  echo "./fgfs --fg-root=\"\$PWD/../fgdata\" \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT

  SCRIPT=run_fgfs_debug.sh
  echo -en "$common" > $SCRIPT
  echo "$gdb --directory='$CBD/flightgear/src' --args ./fgfs --fg-root=\"\$PWD/../fgdata\" \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT

  # Useful for debugging library problems.
  SCRIPT=run_ldd.sh
  cat >"$SCRIPT" <<EndOfScriptText
#!/bin/sh

usage() {
  echo "Usage: \$0 LDD_ARGUMENT..."
  echo "Run 'ldd' with the same LD_LIBRARY_PATH setup as done inside run_fgfs.sh."
  echo
  echo "Examples: 'run_ldd.sh fgfs', 'run_ldd.sh fgcom', etc. (this can be used"
  echo "for any binary in '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin')."
}

if [ \$# -eq 0 ] || [ "\$1" = "--help" ]; then
  usage
  exit 1
fi

cd "\$(dirname "\$0")"
cd '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin'
export LD_LIBRARY_PATH='../../$SIMGEAR_INSTALL_DIR/lib:../../$OSG_INSTALL_DIR/lib:../../$OPENRTI_INSTALL_DIR/lib:../../$PLIB_INSTALL_DIR/lib'"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}"

ldd "\$@"
EndOfScriptText
  chmod 755 "$SCRIPT"

  SCRIPT=run_fgcom.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd '$SUB_INSTALL_DIR/$FGFS_INSTALL_DIR/bin'" >> $SCRIPT
  echo "./fgcom \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# FGRUN
#######################################################
FGRUN_INSTALL_DIR=fgrun
INSTALL_DIR_FGRUN="$INSTALL_DIR/$FGRUN_INSTALL_DIR"
cd "$CBD"
if _elementIn "FGRUN" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** FGRUN *****************"
  _printLog "****************************************"

  mkdir -p "fgrun"
  cd "$CBD"/fgrun
  _gitDownload FGRUN
  _gitUpdate "${COMPONENT_BRANCH[FGRUN]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/fgrun
    cd "$CBD"/build/fgrun
    rm -f CMakeCache.txt
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_FGRUN" \
          -DCMAKE_PREFIX_PATH="$INSTALL_DIR_SIMGEAR" \
          ../../fgrun/ 2>&1 | _logOutput
  fi

  _make fgrun

  cd "$CBD"

  SCRIPT=run_fgrun.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd '$SUB_INSTALL_DIR/$FGRUN_INSTALL_DIR/bin'" >> $SCRIPT
  echo "export LD_LIBRARY_PATH='../../$SIMGEAR_INSTALL_DIR/lib:../../$OSG_INSTALL_DIR/lib:../../$OPENRTI_INSTALL_DIR/lib:../../$PLIB_INSTALL_DIR/lib'\"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}\"" \
       >> $SCRIPT
  echo "./fgrun --fg-exe=\"\$PWD\"/../../'$FGFS_INSTALL_DIR/bin/fgfs' --fg-root=\"\$PWD\"/../../'$FGFS_INSTALL_DIR/fgdata' \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# FGO!
#######################################################
FGO_INSTALL_DIR=fgo
INSTALL_DIR_FGO="$INSTALL_DIR/$FGO_INSTALL_DIR"
cd "$CBD"
if _elementIn "FGO" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "***************** FGO ******************"
  _printLog "****************************************"

  if [ "$DOWNLOAD" = "y" ]; then
    rm -rf fgo*.tar.gz
    wget "https://sites.google.com/site/erobosprojects/flightgear/add-ons/fgo/download/fgo-${COMPONENT_BRANCH[FGO]}.tar.gz" -O fgo.tar.gz
    cd install
    tar -zxvf ../fgo.tar.gz
    cd ..
  fi

  cd "$CBD"

  SCRIPT=run_fgo.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd '$SUB_INSTALL_DIR'" >> $SCRIPT
  echo "cd '$FGO_INSTALL_DIR'" >> $SCRIPT
  echo "python ./fgo" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# FGx
#######################################################
FGX_INSTALL_DIR=fgx
INSTALL_DIR_FGX="$INSTALL_DIR/$FGX_INSTALL_DIR"
cd "$CBD"
if _elementIn "FGX" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "***************** FGX ******************"
  _printLog "****************************************"

  mkdir -p "fgx"
  cd "$CBD"/fgx
  _gitDownload FGX
  _gitUpdate "${COMPONENT_BRANCH[FGX]}"

  cd "$CBD"/fgx/src/
  #Patch in order to pre-setting paths
  cd resources/default/
  cp x_default.ini x_default.ini.orig
  cat x_default.ini | sed s/\\/usr\\/bin\\/fgfs/INSTALL_DIR_FGXMY_SLASH_HERE..MY_SLASH_HEREfgfsMY_SLASH_HEREbinMY_SLASH_HEREfgfs/g > tmp1
  cat tmp1 | sed s/\\/usr\\/share\\/flightgear/INSTALL_DIR_FGXMY_SLASH_HERE..MY_SLASH_HEREfgfsMY_SLASH_HEREfgdata/g > tmp2
  cat tmp2 | sed s/\\/usr\\/bin\\/terrasync/INSTALL_DIR_FGXMY_SLASH_HERE..MY_SLASH_HEREfgfsMY_SLASH_HEREbinMY_SLASH_HEREterrasync/g > tmp3
  cat tmp3 | sed s/\\/usr\\/bin\\/fgcom/INSTALL_DIR_FGXMY_SLASH_HERE..MY_SLASH_HEREfgcomMY_SLASH_HEREbinMY_SLASH_HEREfgcom/g > tmp4
  cat tmp4 | sed s/\\/usr\\/bin\\/js_demo/INSTALL_DIR_FGXMY_SLASH_HERE..MY_SLASH_HEREfgfsMY_SLASH_HEREbinMY_SLASH_HEREjs_demo/g > tmp5
  INSTALL_DIR_FGX_NO_SLASHS=$(echo "$INSTALL_DIR_FGX" | sed -e 's/\//MY_SLASH_HERE/g')
  cat tmp5 | sed s/INSTALL_DIR_FGX/"$INSTALL_DIR_FGX_NO_SLASHS"/g > tmp
  cat tmp | sed s/MY_SLASH_HERE/\\//g > x_default.ini
  rm tmp*

  cd ..
  if [ "$RECONFIGURE" = "y" ]; then
    mkdir -p "$INSTALL_DIR_FGX"
    cd "$INSTALL_DIR_FGX"
    qmake ../../fgx/src
  fi

  if [ "$COMPILE" = "y" ]; then
    cd "$INSTALL_DIR_FGX"
    _printLog "MAKE AND INSTALL FGX"
    _printLog "make $JOPTION $OOPTION"
    make $JOPTION $OOPTION 2>&1 | _logOutput
    cd ..
  fi

  cd "$CBD"

  SCRIPT=run_fgx.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd '$FGX_INSTALL_DIR'" >> $SCRIPT
  echo "./fgx \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# ATC-PIE
#######################################################
ATCPIE_INSTALL_DIR=atc-pie
INSTALL_DIR_ATCPIE="$INSTALL_DIR/$ATCPIE_INSTALL_DIR"
cd "$CBD"
if _elementIn "ATCPIE" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "**************** ATCPIE ***************"
  _printLog "****************************************"

  mkdir -p "$INSTALL_DIR_ATCPIE"
  cd "$INSTALL_DIR_ATCPIE"
  _gitDownload ATCPIE
  _gitUpdate "${COMPONENT_BRANCH[ATCPIE]}"

  cd "$CBD"

  SCRIPT=run_atcpie.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd '$SUB_INSTALL_DIR/$ATCPIE_INSTALL_DIR'" >> $SCRIPT
  echo "./ATC-pie.py \"\$@\"" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# OPENRADAR
#######################################################
OR_INSTALL_DIR=openradar
INSTALL_DIR_OR="$INSTALL_DIR/$OR_INSTALL_DIR"
cd "$CBD"
if _elementIn "OPENRADAR" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "************** OPENRADAR ***************"
  _printLog "****************************************"

  if [ "$DOWNLOAD" = "y" ]; then
    wget http://wagnerw.de/"${COMPONENT_BRANCH[OPENRADAR]}" -O OpenRadar.zip
    cd install
    unzip -o ../OpenRadar.zip
    cd ..
  fi

  SCRIPT=run_openradar.sh
  echo "#!/bin/sh" > $SCRIPT
  echo "cd \"\$(dirname \"\$0\")\"" >> $SCRIPT
  echo "cd install/OpenRadar" >> $SCRIPT
  echo "java -jar OpenRadar.jar" >> $SCRIPT
  chmod 755 $SCRIPT
fi

#######################################################
# TERRAGEAR
#######################################################

TG_INSTALL_DIR=terragear
INSTALL_DIR_TG="$INSTALL_DIR/$TG_INSTALL_DIR"
cd "$CBD"
if _elementIn "TERRAGEAR" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "*************** TERRAGEAR **************"
  _printLog "****************************************"

  mkdir -p "terragear"
  cd "$CBD"/terragear
  _gitDownload TERRAGEAR
  _gitUpdate "${COMPONENT_BRANCH[TERRAGEAR]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/terragear
    cd "$CBD"/build/terragear
    rm -f CMakeCache.txt
    "$CMAKE" -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
          -DCMAKE_INSTALL_PREFIX:PATH="$INSTALL_DIR_TG" \
          -DCMAKE_PREFIX_PATH="$INSTALL_DIR_SIMGEAR;$INSTALL_DIR_CGAL" \
          ../../terragear/ 2>&1 | _logOutput
  fi

  _make terragear

  cd "$CBD"
  echo "#!/bin/sh" > run_tg-construct.sh
  echo "cd \"\$(dirname \"\$0\")\"" >> run_tg-construct.sh
  echo "cd install/terragear/bin" >> run_tg-construct.sh
  echo "export LD_LIBRARY_PATH='$INSTALL_DIR_SIMGEAR/lib'\"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}\"" \
       >> run_tg-construct.sh
  echo "./tg-construct \"\$@\"" >> run_tg-construct.sh

  echo "#!/bin/sh" > run_ogr-decode.sh
  echo "cd \"\$(dirname \"\$0\")\"" >> run_ogr-decode.sh
  echo "cd install/terragear/bin" >> run_ogr-decode.sh
  echo "export LD_LIBRARY_PATH='$INSTALL_DIR_SIMGEAR/lib'\"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}\"" \
       >> run_ogr-decode.sh
  echo "./ogr-decode \"\$@\"" >> run_ogr-decode.sh

  echo "#!/bin/sh" > run_genapts850.sh
  echo "cd \"\$(dirname \"\$0\")\"" >> run_genapts850.sh
  echo "cd install/terragear/bin" >> run_genapts850.sh
  echo "export LD_LIBRARY_PATH='$INSTALL_DIR_SIMGEAR/lib'\"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}\"" \
       >> run_genapts850.sh
  echo "./genapts850 \"\$@\"" >> run_genapts850.sh

  chmod 755 run_tg-construct.sh run_ogr-decode.sh run_genapts850.sh
fi
_logSep

#######################################################
# TERRAGEAR GUI
#######################################################

TGGUI_INSTALL_DIR=terrageargui
INSTALL_DIR_TGGUI="$INSTALL_DIR/$TGGUI_INSTALL_DIR"
cd "$CBD"
if _elementIn "TERRAGEARGUI" "${WHATTOBUILD[@]}"; then
  _printLog "****************************************"
  _printLog "************* TERRAGEAR GUI ************"
  _printLog "****************************************"

  mkdir -p "terrageargui"
  cd "$CBD"/terrageargui
  _gitDownload TERRAGEARGUI
  _gitUpdate "${COMPONENT_BRANCH[TERRAGEARGUI]}"

  if [ "$RECONFIGURE" = "y" ]; then
    cd "$CBD"
    mkdir -p build/terrageargui
    cd "$CBD"/build/terrageargui
    rm -f ../../terrageargui/CMakeCache.txt
    "$CMAKE" -DCMAKE_BUILD_TYPE="Release" \
          -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR_TGGUI" \
          ../../terrageargui 2>&1 | _logOutput
  fi

  _make terrageargui

  cd "$CBD"

  cfgFile="$HOME/.config/TerraGear/TerraGearGUI.conf"
  if [ ! -f "$cfgFile" ]; then
    _log "Writing a default config file for TerraGear GUI: $cfgFile"
    mkdir -p ~/.config/TerraGear
    echo "[paths]" > "$cfgFile"
    echo "terragear=$INSTALL_DIR_TG" >> "$cfgFile"
    echo "flightgear=$INSTALL_DIR_FGFS/fgdata" >> "$cfgFile"
  fi

  SCRIPT=run_terrageargui.sh
  _log "Creating $SCRIPT"
  cat >"$SCRIPT" <<EndOfScriptText
#! /bin/sh
cd "\$(dirname "\$0")"
cd '$SUB_INSTALL_DIR/$TGGUI_INSTALL_DIR/bin'
export LD_LIBRARY_PATH='$INSTALL_DIR_SIMGEAR/lib'"\${LD_LIBRARY_PATH:+:}\${LD_LIBRARY_PATH}"
./TerraGUI "\$@"
EndOfScriptText
  chmod 755 "$SCRIPT"
fi

# Print optional package alternatives that didn't match (this helps with
# troubleshooting)
if [[ ${#UNMATCHED_OPTIONAL_PKG_ALTERNATIVES[@]} -gt 0 ]]; then
  _printLog
  _printLog "The following optional package alternative(s) didn't match:"
  _printLog

  for alt in "${UNMATCHED_OPTIONAL_PKG_ALTERNATIVES[@]}"; do
    _printLog "  $alt"
  done

  _printLog
  _printLog "This could explain missing optional features in FlightGear" \
            "or other software"
  _printLog "installed by $PROGNAME."
elif [[ ${#WHATTOBUILD[@]} -gt 0 ]]; then
  _printLog "All optional package alternatives have found a matching package."
# else we were only running the “cleanup” routine
fi

if [[ ${#WHATTOBUILD[@]} -gt 0 ]]; then
  _printLog
fi
_printLog "$PROGNAME has finished to work."