--- rxvt-unicode/configure.ac	2007/06/25 13:53:42	1.54
+++ rxvt-unicode/configure.ac	2007/06/25 23:11:23	1.55
@@ -80,9 +80,7 @@
 
 case $host in
    *-*-solaris* )
-      AC_DEFINE(_XOPEN_SOURCE_EXTENDED, 1, Needed to get declarations for msg_control and msg_controllen on Solaris)
-      AC_DEFINE(_XOPEN_SOURCE,          2, Needed to get declarations for msg_control and msg_controllen on Solaris)
-      AC_DEFINE(__EXTENSIONS__,         1, Needed to get declarations for msg_control and msg_controllen on Solaris)
+      AC_DEFINE(_XOPEN_SOURCE, 500, Needed to get declarations for msg_control and msg_controllen on Solaris)
       ;;
 esac