diff --git a/Makefile.in b/Makefile.in
index a2a4b20c6..c7441e9a9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -49,7 +49,7 @@ prefix = @prefix@
 optbindirs = @optbindirs@
 PACKAGE_TARNAME = @PACKAGE_TARNAME@
 
-MACROS=-DLOCALEDIR=\"$(localedir)\" -DPREFIX=L\"$(prefix)\" -DDATADIR=L\"$(datadir)\" -DSYSCONFDIR=L\"$(sysconfdir)\" -D_POSIX_C_SOURCE=200112L
+MACROS=-DLOCALEDIR=\"$(localedir)\" -DPREFIX=L\"$(prefix)\" -DDATADIR=L\"$(datadir)\" -DSYSCONFDIR=L\"$(sysconfdir)\" 
 CFLAGS=@CFLAGS@ $(MACROS)
 CPPFLAGS=@CPPFLAGS@
 LDFLAGS= @LIBS@ @LDFLAGS@ 
diff --git a/configure.ac b/configure.ac
index 0fdc27d32..2e8d4ccef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,6 +72,8 @@ for i in /usr/pkg /sw /opt /opt/local; do
 
 done
 
+CFLAGS="$CFLAGS -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112L"
+
 AC_SUBST( optbindirs, $optbindirs )
 
 # Tell autoconf to create config.h header