configure.ac: use /Developer/SDKs/MacOSX10.5.sdk

First, this is not a nice fix. I am also not sure why the error happens in the first place. I assume Apple deprecated some stuff in 10.6 + x86_64. My patch simply uses the 10.5 SDK if compiling on 10.6 Snow Leopard - which is installed by default if you install XCode 3.2 that comes with Snow Leopard. The reason this is not a nice fix is, of course, that this doesn't fix the problem. It just "postpones" it to the next release of MacOS X. But, some people may need it, and its better than nothing.

configure.ac: use /Developer/SDKs/MacOSX10.5.sdk
4ebf53ff · Patrik Weiskircher · Max Kellermann · 8b6a5d19 · 4ebf53ff
Commit 4ebf53ff authored Sep 06, 2009 by Patrik Weiskircher Committed by Max Kellermann Sep 06, 2009
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configure.ac configure.ac +6 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -748,6 +748,12 @@ case "$host_os" in
 		enable_osx=yes ;;
 esac

+case "$host_os" in
+	darwin10*)
+		CFLAGS="$CFLAGS -isysroot /Developer/SDKs/MacOSX10.5.sdk"
+		;;
+esac
+
 AM_CONDITIONAL(HAVE_OSX, test x$enable_osx = xyes)

 AC_ARG_ENABLE(shout,