--- a/src/memcache.c
+++ b/src/memcache.c
@@ -28,6 +28,7 @@
  * included, therefore it is assumed that this code is public
  * domain.  Attribution still noted. */
 
+#define _XOPEN_SOURCE 700
 #ifdef HAVE_CONFIG_H
 # include "config.h"
 #endif
@@ -39,13 +40,6 @@
 #include <sysexits.h>
 #include <errno.h>
 #include <sys/types.h>
-#ifdef __linux
-# ifndef __USE_POSIX
-#  define __USE_POSIX
-#warning "Working around busted-ass Linux header include problems: use FreeBSD instead"
-#warning "http://www.FreeBSD.org/ - you won't regret it"
-# endif
-#endif
 #include <sys/time.h>
 #include <sys/socket.h>
 #include <sys/uio.h>