[zenity] Make zenity compile only with GTK+-3.0

[Luis Medinas <lmedinas src gnome org>]

commit a9dabc7737f73cdf02fa067426f26f113a771205
Author: Luis Medinas <lmedinas gnome org>
Date:   Sat Oct 2 20:57:53 2010 +0100

    Make zenity compile only with GTK+-3.0
    
    In preparation for GNOME 3.0.

 configure.in |   27 ++++-----------------------
 1 files changed, 4 insertions(+), 23 deletions(-)
---
diff --git a/configure.in b/configure.in
index 3eb1808..3348f95 100644
--- a/configure.in
+++ b/configure.in
@@ -18,28 +18,9 @@ IT_PROG_INTLTOOL([0.40.0])
 
 AC_PROG_CC
 
-GTK_REQUIRED=2.18.0
-
-AC_MSG_CHECKING([which gtk+ version to compile against])
-AC_ARG_WITH([gtk],
-  [AS_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 "$with_gtk" in
-  2.0) GTK_API_VERSION=2.0
-       GTK_REQUIRED=2.18.0
-       ;;
-  3.0) GTK_API_VERSION=3.0
-       GTK_REQUIRED=2.90.4
-       ;;
-esac
-
-PKG_CHECK_MODULES([ZENITY],[gtk+-$GTK_API_VERSION >= $GTK_REQUIRED glib-2.0])
+GTK_REQUIRED=2.91.0
+
+PKG_CHECK_MODULES([ZENITY],[gtk+-3.0 >= $GTK_REQUIRED glib-2.0])
 AC_SUBST([ZENITY_CFLAGS])
 AC_SUBST([ZENITY_LIBS])
 
@@ -49,7 +30,7 @@ dnl *************************
 
 zenity_save_cflags="$CFLAGS"
 # pull in the CFLAGS to locate gdkconfig.h
-CFLAGS=`$PKG_CONFIG --cflags gtk+-2.0`
+CFLAGS=`$PKG_CONFIG --cflags gtk+-3.0`
 AC_COMPILE_IFELSE([
 #include <gdkconfig.h>