--- rxvt-unicode/src/rxvtutil.C	2014/05/22 18:54:33	1.19
+++ rxvt-unicode/src/rxvtutil.C	2014/10/24 14:53:20	1.20
@@ -20,6 +20,14 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *----------------------------------------------------------------------*/
 
+// we include emman.c here to avoid relying on a C compiler, or
+// on the c++ compiler not complaining about .c, which is unlikely,
+// but...
+// This must be the first include, because the _GNU_SOURCE and
+// _XOPEN_SOURCE macros, used by emman.c, must be defined before
+// inclusion of any header.
+#include "emman.c"
+
 #include <stdlib.h>
 #include <string.h>
 #include <inttypes.h>
@@ -57,8 +65,3 @@
   return temp_buf;
 }
 
-// we include emman.c here to avoid relying on a C compiler, or
-// on the c++ compiler not complaining about .c, which is unlikely,
-// but...
-#include "emman.c"
-