diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 1514d719b..79cd0f974 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2003-04-25  Corinna Vinschen  <corinna@vinschen.de>
+
+	* include/netinet/ip.h: Include netinet/in_systm.h and netinet/in.h
+	to allow standalone usage (autoconf).
+
 2003-04-23  Christopher Faylor  <cgf@redhat.com>
 
 	* fork.cc: Change SLOW_PID_REUSE to NO_SLOW_PID_REUSE and invert ifdef
diff --git a/winsup/cygwin/include/netinet/ip.h b/winsup/cygwin/include/netinet/ip.h
index a8dac5b67..87b5068d0 100644
--- a/winsup/cygwin/include/netinet/ip.h
+++ b/winsup/cygwin/include/netinet/ip.h
@@ -37,6 +37,9 @@
 #ifndef _NETINET_IP_H
 #define _NETINET_IP_H
 
+#include <netinet/in_systm.h>
+#include <netinet/in.h>
+
 /* Added by Wu Yongwei */
 #ifndef LITTLE_ENDIAN
 #define LITTLE_ENDIAN   1234