From b5572025d76b5bf4891b1ff260981680f2739992 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <LukeShu@sbcglobal.net>
Date: Fri, 18 Oct 2013 14:32:35 -0400
Subject: configure.ac: add a --with-gtk={2.0,3.0} option to select GTK+
 versions

---
 configure.ac | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index d480d8c..072bd44 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,9 +14,27 @@ m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 # Check for programs
 AC_PROG_CC
 
-GTK_REQUIRED=3.0.0
-
-PKG_CHECK_MODULES([ZENITY],[gtk+-3.0 >= $GTK_REQUIRED glib-2.0])
+AC_ARG_WITH([gtk],
+            [AC_HELP_STRING([--with-gtk=2.0|3.0],[Which version of GTK+ to use (default: 3.0)])],
+            [
+              case "$with_gtk" in
+	        2.0|3.0) ;;
+		*) AC_MSG_ERROR([`--with-gtk=$with_gtk' is invalid; this option's value should be `2.0' or `3.0']) ;;
+              esac
+            ],
+            [with_gtk=3.0])
+AC_MSG_RESULT([$with_gtk])
+
+case "$with_gtk" in
+  2.0) GTK_VERSION=2.0
+       GTK2_REQUIRED=2.24.0
+       ;;
+  3.0) GTK_VERSION=3.0
+       GTK_REQUIRED=3.0.0
+       ;;
+esac
+
+PKG_CHECK_MODULES([ZENITY],[gtk+-$GTK_VERSION >= $GTK_REQUIRED glib-2.0])
 AC_SUBST([ZENITY_CFLAGS])
 AC_SUBST([ZENITY_LIBS])
 
@@ -26,7 +44,7 @@ dnl *************************
 
 zenity_save_cflags="$CFLAGS"
 # pull in the CFLAGS to locate gdkconfig.h
-CFLAGS=`$PKG_CONFIG --cflags gtk+-3.0`
+CFLAGS=`$PKG_CONFIG --cflags gtk+-$GTK_VERSION`
 AC_COMPILE_IFELSE([
 #include <gdk/gdk.h>
 
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