Several fixes needed to improve Windows support

* Add support for detecting fontconfig.h header
* Call find_package(Freetype) since it's required
* Add support for allowing users to add additional library directories
  via the GTK2_ADDITIONAL_SUFFIXES variable (kind of a future-kludge in
  case the GTK developers change versions on any of the directories in the
  future).
* Fixed a problem on Windows where you had to configure twice to find
  the gtk & gdk libraries

Modules/FindGTK2.cmake

@@ -28,6 +28,8 @@
 #
 #   GTK2_DEBUG - Enables verbose debugging of the module
 #   GTK2_SKIP_MARK_AS_ADVANCED - Disable marking cache variables as advanced
+#   GTK2_ADDITIONAL_SUFFIXES - Allows defining additional directories to
+#                              search for include files
 #
 #=================
 # Example Usage:
@@ -64,6 +66,15 @@
 # (To distribute this file outside of CMake, substitute the full
 #  License text for the above reference.)
 
+# Version 1.0 (8/12/2010)
+#   * Add support for detecting new pangommconfig.h header file
+#     (Thanks to Sune Vuorela & the Debian Project for the patch)
+#   * Add support for detecting fontconfig.h header
+#   * Call find_package(Freetype) since it's required
+#   * Add support for allowing users to add additional library directories
+#     via the GTK2_ADDITIONAL_SUFFIXES variable (kind of a future-kludge in
+#     case the GTK developers change versions on any of the directories in the
+#     future).
 # Version 0.8 (1/4/2010)
 #   * Get module working under MacOSX fink by adding /sw/include, /sw/lib
 #     to PATHS and the gobject library
@@ -131,7 +142,8 @@ function(_GTK2_FIND_INCLUDE_DIR _var _hdr)
     endif()
 
     set(_relatives
-        # FIXME
+        # If these ever change, things will break.
+        ${GTK2_ADDITIONAL_SUFFIXES}
         glibmm-2.4
         glib-2.0
         atk-1.0
@@ -390,6 +402,10 @@ endif()
 # Find all components
 #
 
+find_package(Freetype)
+list(APPEND GTK2_INCLUDE_DIRS ${FREETYPE_INCLUDE_DIRS})
+list(APPEND GTK2_LIBRARIES ${FREETYPE_LIBRARIES})
+
 foreach(_GTK2_component ${GTK2_FIND_COMPONENTS})
     if(_GTK2_component STREQUAL "gtk")
         _GTK2_FIND_INCLUDE_DIR(GTK2_GLIB_INCLUDE_DIR glib.h)
@@ -401,16 +417,21 @@ foreach(_GTK2_component ${GTK2_FIND_COMPONENTS})
 
         _GTK2_FIND_INCLUDE_DIR(GTK2_GDK_INCLUDE_DIR gdk/gdk.h)
         _GTK2_FIND_INCLUDE_DIR(GTK2_GDKCONFIG_INCLUDE_DIR gdkconfig.h)
-        _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-x11 false true)
-        _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-win32 false true)
-
         _GTK2_FIND_INCLUDE_DIR(GTK2_GTK_INCLUDE_DIR gtk/gtk.h)
-        _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-x11 false true)
-        _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-win32 false true)
+
+        if(UNIX)
+            _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-x11 false true)
+            _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-x11 false true)
+        else()
+            _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-win32 false true)
+            _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-win32 false true)
+        endif()
 
         _GTK2_FIND_INCLUDE_DIR(GTK2_CAIRO_INCLUDE_DIR cairo.h)
         _GTK2_FIND_LIBRARY    (GTK2_CAIRO_LIBRARY cairo false false)
 
+        _GTK2_FIND_INCLUDE_DIR(GTK2_FONTCONFIG_INCLUDE_DIR fontconfig/fontconfig.h)
+
         _GTK2_FIND_INCLUDE_DIR(GTK2_PANGO_INCLUDE_DIR pango/pango.h)
         _GTK2_FIND_LIBRARY    (GTK2_PANGO_LIBRARY pango false true)