What is the correct way to check for the presence of gdkx.h on a system?
This doesn't work for me:
+# Checks for GDK X11 support; GDK & GTK on Mac OS X do not provide X11
+# extensions if compiled to use the Quartz backend.
+#
+HAVE_GDKX=no
+AC_CHECK_HEADER(gdk/gdkx.h,
+ [HAVE_GDKX=yes]
+ [AC_MSG_WARN(Disabling GDK/X11-dependent features.)])
It always returns "no", even on systems where it is present.
My understanding of autotools and makefiles is pretty limited...
- Mike
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