[],
[with_gssapi=yes])
+AC_ARG_WITH([quartz],
+ [AS_HELP_STRING([--with-quartz],
+ [build for the MacOS Quartz GTK back end])],
+ [AC_DEFINE([OSX_GTK], [1], [Define if building with GTK for MacOS.])],
+ [])
+
WITH_GSSAPI=
AS_IF([test "x$with_gssapi" != xno],
[AC_DEFINE([WITH_GSSAPI], [1], [Define if building with GSSAPI support.])])