BuildSystem: When no download utility is available, display the explanation.

./configure --with-pjproject-bundled
did not display an explanation, when no download utility like wget, curl, or
fetch was installed beforehand, although an explanation existed in code. This
happened because the code expected the variable DOWNLOAD_TO_STDOUT to be empty.
However, the script ./configure set that variable always.

Change-Id: I64c99b76a03525c69471e5055bf124b36a51bbd4

configure

@@ -7816,6 +7816,9 @@ fi
 
 
 
+DOWNLOAD=":"
+DOWNLOAD_TO_STDOUT=
+DOWNLOAD_TIMEOUT=
 if test "${WGET}" != ":" ; then
   DOWNLOAD=${WGET}
   DOWNLOAD_TO_STDOUT="${WGET} -q -O-"
@@ -7866,16 +7869,17 @@ $as_echo "no" >&6; }
 fi
 
 
-  DOWNLOAD=${FETCH}
-  DOWNLOAD_TO_STDOUT="${FETCH} -o-"
-  DOWNLOAD_TIMEOUT='--timeout=$(or $2,$1)'
+  if test "${FETCH}" != ":" ; then
+    DOWNLOAD=${FETCH}
+    DOWNLOAD_TO_STDOUT="${FETCH} -o-"
+    DOWNLOAD_TIMEOUT='--timeout=$(or $2,$1)'
+  fi
 fi
 fi
 
 
 
 
-
 # Extract the first word of "ldconfig", so it can be a program name with args.
 set dummy ldconfig; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -9204,7 +9208,7 @@ $as_echo_n "checking for embedded pjproject (may have to download)... " >&6; }
 $as_echo "configuring" >&6; }
 
 	if test "x${DOWNLOAD_TO_STDOUT}" = "x" ; then
-		as_fn_error $? "A download utility (wget, curl or fetch) is required to download bundled pjproject" "$LINENO" 5
+		as_fn_error $? "A download utility (wget, curl, or fetch) is required to download bundled pjproject" "$LINENO" 5
 	fi
 	if test "${BZIP2}" = ":" ; then
 		as_fn_error $? "bzip2 is required to extract the pjproject tar file" "$LINENO" 5

configure.ac

@@ -286,6 +286,9 @@ AC_PATH_PROG([PATCH], [patch], :)
 AC_PATH_PROG([SED], [sed], :)
 AC_PATH_PROG([NM], [nm], :)
 
+DOWNLOAD=":"
+DOWNLOAD_TO_STDOUT=
+DOWNLOAD_TIMEOUT=
 if test "${WGET}" != ":" ; then
   DOWNLOAD=${WGET}
   DOWNLOAD_TO_STDOUT="${WGET} -q -O-"
@@ -295,13 +298,14 @@ else if test "${CURL}" != ":" ; then
   DOWNLOAD_TO_STDOUT="${CURL} -Ls"
   DOWNLOAD_TIMEOUT='--max-time $(or $2,$1)'
 else
-  AC_PATH_PROG([FETCH], [fetch], [:])
-  DOWNLOAD=${FETCH}
-  DOWNLOAD_TO_STDOUT="${FETCH} -o-"
-  DOWNLOAD_TIMEOUT='--timeout=$(or $2,$1)'
+  AC_PATH_PROG([FETCH], [fetch], :)
+  if test "${FETCH}" != ":" ; then
+    DOWNLOAD=${FETCH}
+    DOWNLOAD_TO_STDOUT="${FETCH} -o-"
+    DOWNLOAD_TIMEOUT='--timeout=$(or $2,$1)'
+  fi
 fi
 fi
-
 AC_SUBST(DOWNLOAD)
 AC_SUBST(DOWNLOAD_TO_STDOUT)
 AC_SUBST(DOWNLOAD_TIMEOUT)

sounds/Makefile

@@ -127,9 +127,9 @@ have_download:
 	@if test "$(DOWNLOAD)" = ":" ; then \
 		echo "**************************************************"; \
 		echo "***                                            ***"; \
-		echo "*** You must have either wget or fetch to be   ***"; \
-		echo "*** able to automatically download and install ***"; \
-		echo "*** the requested sound packages.              ***"; \
+		echo "*** You must have either wget, curl, or fetch  ***"; \
+		echo "*** to be able to automatically download and   ***"; \
+		echo "*** install the requested sound packages.      ***"; \
 		echo "***                                            ***"; \
 		echo "*** Please install one of these, or remove any ***"; \
 		echo "*** extra sound package selections in          ***"; \

third-party/pjproject/configure.m4

@@ -16,7 +16,7 @@ AC_DEFUN([_PJPROJECT_CONFIGURE],
 	AC_MSG_RESULT(configuring)
 
 	if test "x${DOWNLOAD_TO_STDOUT}" = "x" ; then
-		AC_MSG_ERROR(A download utility (wget, curl or fetch) is required to download bundled pjproject)
+		AC_MSG_ERROR(A download utility (wget, curl, or fetch) is required to download bundled pjproject)
 	fi
 	if test "${BZIP2}" = ":" ; then
 		AC_MSG_ERROR(bzip2 is required to extract the pjproject tar file)