--- a/configure.in	Mon Aug 13 21:06:06 2012 +0200
+++ b/configure.in	Tue Aug 14 20:22:37 2012 +0200
@@ -190,12 +190,21 @@
 fi
 
 AM_PATH_GLIB_2_0(2.4.0,,AC_MSG_ERROR(GLIB >= 2.4.0 not installed.))
-AC_ARG_ENABLE([gtk3], AC_HELP_STRING([--disable-gtk3], [use gtk2 instead of gtk3]),[gtk3="${enableval}"], [gtk3=m4_ifdef([AM_PATH_GTK_3_0], [yes], [no])])
+AC_ARG_ENABLE([gtk3], AC_HELP_STRING([--disable-gtk3], [use gtk2 instead of gtk3]),[gtk3="${enableval}"], [gtk3=m4_ifdef([AM_PATH_GTK_3_0], [auto], [no])])
 
 if test x$gtk3 == xyes; then
+    AC_MSG_WARN("Gtk3 enabled")
     m4_ifdef([AM_PATH_GTK_3_0], [AM_PATH_GTK_3_0(3.0.0,,AC_MSG_ERROR(GTK+ >= 3.0.0 not installed.))])
 else
-    m4_ifdef([AM_PATH_GTK_2_0], [AM_PATH_GTK_2_0(2.12.0,,AC_MSG_ERROR(GTK+ >= 2.12.0 not installed.))])
+    if test x$gtk3 != xno; then
+       AC_MSG_WARN("Gtk3 is preferred...")
+       m4_ifdef([AM_PATH_GTK_3_0], [AM_PATH_GTK_3_0(3.0.0,,[gtk3=no])])
+    fi
+fi
+
+if test x$gtk3 == xno; then
+    m4_ifdef([AM_PATH_GTK_2_0], [AM_PATH_GTK_2_0(2.20.0,,AC_MSG_ERROR(GTK+ >= 2.12.0 not installed.))])
+    true
 fi
 
 threads="auto"