[metacity] Allow building with Gtk+-3.0

[Thomas James Alexander Thurman <tthurman src gnome org>]

commit f701f761908509f48d905fa8c687cec6d5447368
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Jun 19 18:39:48 2010 +0200

    Allow building with Gtk+-3.0
    
    Add a configure switch to select the Gtk+ version to build with. The
    default is to build against Gtk+-2.0 >= 2.20.0.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622285

 configure.in |   31 +++++++++++++++++++++++++++----
 1 files changed, 27 insertions(+), 4 deletions(-)
---
diff --git a/configure.in b/configure.in
index 67b6ba5..d84d38e 100644
--- a/configure.in
+++ b/configure.in
@@ -107,7 +107,30 @@ if test "x$GCC" = "xyes"; then
 fi
 changequote([,])dnl
 
-METACITY_PC_MODULES='gtk+-2.0 >= 2.20.0 pango >= 1.2.0 libcanberra-gtk'
+AC_MSG_CHECKING([which gtk+ version to compile against])
+AC_ARG_WITH([gtk],
+  AC_HELP_STRING([--with-gtk=2.0|3.0],
+                 [which gtk+ version to compile against (default: 2.0)]),
+  [case "$with_gtk" in
+      2.0|3.0) ;;
+      *) AC_MSG_ERROR([invalid gtk+ version specified]);;
+  esac],
+  [with_gtk=2.0])
+AC_MSG_RESULT([$with_gtk])
+
+case "$with_gtk" in
+  2.0) GTK_API_VERSION=2.0
+       GTK_MIN_VERSION=2.20.0
+       CANBERRA_GTK=libcanberra-gtk
+       ;;
+  3.0) GTK_API_VERSION=3.0
+       GTK_MIN_VERSION=2.90.0
+       CANBERRA_GTK=libcanberra-gtk3
+       ;;
+esac
+
+METACITY_PC_MODULES="gtk+-$GTK_API_VERSION >= $GTK_MIN_VERSION pango >= 1.2.0 $CANBERRA_GTK"
+AC_SUBST(GTK_API_VERSION)
 
 AC_ARG_ENABLE(gconf,
   AC_HELP_STRING([--disable-gconf],
@@ -167,8 +190,8 @@ AM_GLIB_GNU_GETTEXT
 # GOptionEntry requires         glib-2.6.0
 PKG_CHECK_MODULES(ALL, glib-2.0 >= 2.6.0)
 # gtk_window_set_icon_name requires gtk2+-2.60
-PKG_CHECK_MODULES(METACITY_MESSAGE, gtk+-2.0 >= 2.6.0)
-PKG_CHECK_MODULES(METACITY_WINDOW_DEMO, gtk+-2.0 >= 2.19.7)
+PKG_CHECK_MODULES(METACITY_MESSAGE, gtk+-$GTK_API_VERSION >= $GTK_MIN_VERSION)
+PKG_CHECK_MODULES(METACITY_WINDOW_DEMO, gtk+-$GTK_API_VERSION >= $GTK_MIN_VERSION)
 
 if $PKG_CONFIG --atleast-version 1.2.0 pangoxft; then
    echo "pangoxft found"
@@ -537,7 +560,7 @@ fi
 
 dnl ==========================================================================
 echo "
-metacity-$VERSION:
+metacity-$VERSION (using gtk+-${GTK_API_VERSION}):
 
 	prefix:                   ${prefix}
 	source code location:	  ${srcdir}