--- rxvt-unicode/configure.ac	2007/12/10 23:36:05	1.89
+++ rxvt-unicode/configure.ac	2007/12/10 23:41:15	1.90
@@ -32,6 +32,7 @@
 AC_PROG_INSTALL
 
 AC_AIX
+AC_GNU_SOURCE
 AC_ISC_POSIX
 AC_LANG(C++)
 
@@ -70,8 +71,6 @@
   CFLAGS="$CXXFLAGS"
 fi
 
-AC_DEFINE(_GNU_SOURCE, 1, Use all glibc features.)
-
 case $host in
    *-*-solaris* )
       AC_DEFINE(_XOPEN_SOURCE, 500, Needed to get declarations for msg_control and msg_controllen on Solaris)