Additional configure changes.

README.plib

@@ -0,0 +1,16 @@
+[This file is mirrored in both the FlightGear and SimGear packages.]
+
+You *must* have plib version 1.6.0 or later installed on your system
+to build FlightGear!"  Flight Gear is no longer compatible with the
+earlier versions of the library.
+
+You can get the latest version of plib from:
+
+    http://plib.sourceforge.net
+
+Build notes:
+
+You should be able to just run "./configure" to configure the package
+and use all of plib's defaults.  Then run "make" followed by "make
+install".  By default, plib installs itself into /usr so if you don't
+like this, be sure to specify an alternate prefix such as --prefix=/usr/local

autogen.sh

@@ -2,7 +2,7 @@
 
 OSTYPE=`uname -s`
 MACHINE=`uname -m`
-AUTO_MAKE_VERSION=`automake --version | head -1 | awk '{print $4}' | sed -e 's/\-p[0-9]$//' | sed -e 's/\.//'`
+AUTO_MAKE_VERSION=`automake --version | head -1 | awk '{print $4}' | sed -e 's/\.\([0-9]*\).*/\1/'`
 
 echo "Host info: $OSTYPE $MACHINE"
 echo -n " automake: `automake --version | head -1 | awk '{print $4}'`"

configure.ac

@@ -56,9 +56,15 @@ fi
          
 # Determine version of automake ... important because of
 # incompatibilities between versions
-AUTO_MAKE_VERSION=`automake --version | head -1 | awk '{print $4}' | sed -e 's/\-p[[0-9]]$//' | sed -e 's/\.//'`
-AM_CONDITIONAL(ANCIENT_AUTOMAKE, test $AUTO_MAKE_VERSION -lt 14)
-AM_CONDITIONAL(OLD_AUTOMAKE, test $AUTO_MAKE_VERSION -lt 15)
+AUTO_MAKE_VERSION=`automake --version | head -1 | awk '{print $4}' | sed -e 's/\.\([0-9]*\).*/\1/'`
+if test $AUTO_MAKE_VERSION -lt 15; then\
+    echo ""
+    echo "You need to upgrade to automake version 1.5 or greater."
+    echo "Most distributions have packages available to install or you can"
+    echo "find the source for the most recent version at"
+    echo "ftp://ftp.gnu.org/gnu/automake"
+    exit 1
+fi
 
 # set logging default value
 # with_logging=yes
@@ -113,7 +119,7 @@ AM_CONDITIONAL(IS_CYGWIN, test "x$is_cygwin" = "xyes")
 
 if test "x$HOSTTYPE" != "xmacintosh" -a "x$is_mingw" != "xyes"; then
     dnl extra library and include directories
-    EXTRA_DIRS="/usr/local /usr/local/plib /usr/X11R6"
+    EXTRA_DIRS="/usr/local /usr/X11R6"
 
     if test -d /opt/X11R6 ; then
         EXTRA_DIRS="$EXTRA_DIRS /opt/X11R6"
@@ -271,11 +277,11 @@ AM_CONDITIONAL(HAVE_XWINDOWS, test "x$ac_cv_lib_X11_XCreateWindow" = "xyes" )
 AC_LANG_PUSH(C++)
 
 dnl Check for "plib" without which we cannot go on
-AC_CHECK_HEADER(plib/pu.h)
-if test "x$ac_cv_header_plib_pu_h" != "xyes"; then
+AC_CHECK_HEADER(plib/ul.h)
+if test "x$ac_cv_header_plib_ul_h" != "xyes"; then
     echo
     echo "You *must* have the plib library installed on your system to build"
-    echo "the FGFS simulator!"
+    echo "SimGear!"
     echo
     echo "Please see README.plib for more details."
     echo
@@ -283,10 +289,28 @@ if test "x$ac_cv_header_plib_pu_h" != "xyes"; then
     exit
 fi
 
-AC_CHECK_HEADER(plib/ssgaLensFlare.h)
-if test "x$ac_cv_header_plib_ssgaLensFlare_h" = "xyes"; then
-    AC_DEFINE([FG_CHEESY_LENS_FLARE], 1, [Define for cheesy lens flare effect])
-fi
+AC_MSG_CHECKING([for plib 1.6.0 or newer])
+AC_TRY_RUN([
+#include <plib/ul.h>
+
+#define MIN_PLIB_VERSION 160
+
+int main() {
+    int major, minor, micro;
+
+    if ( PLIB_VERSION < MIN_PLIB_VERSION ) {
+	 return -1;
+    }
+
+    return 0;
+}
+
+],
+  AC_MSG_RESULT(yes),
+  [AC_MSG_RESULT(wrong version);
+   AC_MSG_ERROR([Install plib 1.6.0 or later first...])],
+  AC_MSG_RESULT(yes)
+)
 
 dnl Check for system installed metakit
 AC_CHECK_HEADER(mk4.h)

simgear/sky/oursun.cxx

@@ -37,7 +37,10 @@
 #include <plib/sg.h>
 #include <plib/ssg.h>
 
-#ifdef FG_PLIB_SUPPORTS_LENS_FLARE
+// define the following to enable a cheesy lens flare effect for the sun
+// #define FG_TEST_CHEESY_LENS_FLARE
+
+#ifdef FG_TEST_CHEESY_LENS_FLARE
 #  include <plib/ssgaLensFlare.h>
 #endif
 
@@ -314,14 +317,9 @@ ssgBranch * SGSun::build( SGPath path, double sun_size ) {
     sun_transform->addKid( halo );
     sun_transform->addKid( orb );
 
-#if 0
-    // enable this code to add a super cheesy lens flare effect to the sun.
-
-# ifdef FG_PLIB_SUPPORTS_LENS_FLARE
+#ifdef FG_TEST_CHEESY_LENS_FLARE
     // cheesy lens flair
     sun_transform->addKid( new ssgaLensFlare );
-# endif
-
 #endif
 
     return sun_transform;