[AC_MSG_ERROR([gtk+-2.x is missing or not built with X support])])
AC_CHECK_LIB([gthread-2.0], [g_thread_init], [],
[AC_MSG_ERROR([libgthread-2.0 is missing, usually provided by glib-2.x])])
[AC_MSG_ERROR([gtk+-2.x is missing or not built with X support])])
AC_CHECK_LIB([gthread-2.0], [g_thread_init], [],
[AC_MSG_ERROR([libgthread-2.0 is missing, usually provided by glib-2.x])])