AST_EXT_LIB_CHECK([X11], [X11], [XOpenDisplay], [X11/Xlib.h],,, [standard_path])
AST_EXT_LIB_CHECK([X11], [X11], [XOpenDisplay], [X11/Xlib.h],, [-I/usr/X11R6/include], [X11R6])
-# we don't use gtk right now...
-AST_EXT_TOOL_CHECK([GTK], [gtk])
+PBX_GTK=0
+AC_CHECK_TOOL(GTKCONFIG, gtk-config, No)
+if test ! "x${GTKCONFIG}" = xNo; then
+ GTK_INCLUDE=$(${GTKCONFIG} --cflags gthread)
+ GTK_LIB=$(${GTKCONFIG} --libs gthread)
+ PBX_GTK=1
+ AC_DEFINE([HAVE_GTK], 1, [Define if your system has the GTK libraries.])
+fi
+AC_SUBST(PBX_GTK)
+AC_SUBST(GTK_INCLUDE)
+AC_SUBST(GTK_LIB)
PBX_GTK2=0
AC_CHECK_TOOL(PKGCONFIG, pkg-config, No)