diff --git a/include/common/compat.h b/include/common/compat.h
new file mode 100644
index 0000000..a605da1
--- /dev/null
+++ b/include/common/compat.h
@@ -0,0 +1,62 @@
+/*
+  include/common/compat.h
+  Operating system compatibility interface.
+
+  Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu
+  
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation, version 2.1
+  exclusively.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _COMMON_COMPAT_H
+#define _COMMON_COMPAT_H
+
+/* This is needed on Linux for Netfilter includes */
+#include <sys/socket.h>
+
+/* INTBITS
+ * how many bits are needed to code the size of an int on the target platform.
+ * (eg: 32bits -> 5)
+ */
+#define	INTBITS	        5
+
+/* this is for libc5 for example */
+#ifndef TCP_NODELAY
+#define TCP_NODELAY     1
+#endif
+
+#ifndef SHUT_RD
+#define SHUT_RD	        0
+#endif
+
+#ifndef SHUT_WR
+#define SHUT_WR	        1
+#endif
+
+#if defined(TPROXY) && defined(NETFILTER)
+#include <linux/netfilter_ipv4.h>
+#endif
+
+#if defined(__dietlibc__)
+#include <strings.h>
+#endif
+
+#endif /* _COMMON_COMPAT_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */