--- socat-1.7.2.2.orig/xio-tun.c	2011-12-06 08:45:03.000000000 +0100
+++ socat-1.7.2.2/xio-tun.c	2013-12-25 15:51:46.000000000 +0100
@@ -14,6 +14,12 @@
 
 #include "xio-tun.h"
 
+#if !defined(__GLIBC__)
+#define IFF_TUN                0x0001
+#define IFF_TAP                0x0002
+#define IFF_NO_PI      0x1000
+#define TUNSETIFF     _IOW('T', 202, int)
+#endif
 
 static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *fd, unsigned groups, int dummy1, int dummy2, int dummy3);
 
