[gdk-pixbuf] Don't detect X11 automagically

[Matthias Clasen <matthiasc src gnome org>]

commit e6734ba07c81f1a0fd3e577ddd2a0d121fc92af1
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Dec 16 15:21:15 2011 -0500

    Don't detect X11 automagically
    
    Instead, add an explicit --with-x11 option and default it to 'no'.
    Based on a patch by Pacho Ramos, bug 657569.

 configure.ac |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fc2c059..af15e80 100644
--- a/configure.ac
+++ b/configure.ac
@@ -926,7 +926,11 @@ GDK_PIXBUF_XLIB_PACKAGES=
 GDK_PIXBUF_XLIB_EXTRA_CFLAGS=
 GDK_PIXBUF_XLIB_EXTRA_LIBS=
 
-if $PKG_CONFIG --exists x11; then
+AC_ARG_WITH(x11,
+            [AC_HELP_STRING([--with-x11],
+                            [build X11 support])])
+
+if test x$with_x11 = xyes; then
   AM_CONDITIONAL(USE_X11, true)
   PKG_CHECK_MODULES(GDK_PIXBUF_XLIB_DEP, x11 gobject-2.0)
 else