[clutter] build: Depend on pangoft2 on X11

[Emmanuele Bassi <ebassi src gnome org>]

commit e906d2cbde5c1db4238660002f858111de8548c3
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Thu Aug 18 15:32:29 2011 +0100

    build: Depend on pangoft2 on X11
    
    We need the fontconfig API to reinitialize the fontmap caches whenever
    the system tells us that the user fonts have changed.

 configure.ac |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e0bae74..94f8ff8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -386,10 +386,21 @@ AS_CASE([$CLUTTER_FLAVOUR],
           CLUTTER_SONAME_INFIX=win32
         ],
 
-        [AC_MSG_ERROR([Invalid backend for Clutter: use glx, osx,
-                      win32, eglx or eglnative])]
+        [AC_MSG_ERROR([Invalid backend for Clutter])]
 )
 
+AS_IF([test "x$SUPPORT_X11" = "x1"],
+      [
+        # we use fontconfig API and pango-fc when the fontconfig
+        # configuration changes
+        PKG_CHECK_EXISTS([pangoft2],
+                         [
+                           AC_DEFINE([HAVE_PANGO_FT2], [1], [Supports PangoFt2])
+                           BACKEND_PC_FILES="$BACKEND_PC_FILES pangoft2"
+                         ],
+                         [])
+      ])
+
 AS_IF([test "x$SUPPORT_GLX" = "x1"],
       [
         AC_DEFINE([HAVE_CLUTTER_GLX], [1], [Have the GLX backend])