diff --git a/Makefile b/Makefile
index 888c591..af1f798 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@
 # DEBUG = -g -DRDP_DEBUG
 
 CC     = gcc
-CFLAGS = -O2 -Wall $(DEBUG)
+CFLAGS = -O2 -Wall $(DEBUG) -I/usr/X11R6/include
 LIBS   = -L/usr/X11R6/lib -lX11
 
 RDPOBJ = rdesktop.o tcp.o iso.o mcs.o secure.o licence.o rdp.o orders.o bitmap.o cache.o xwin.o
diff --git a/tcp.c b/tcp.c
index 95fa2de..c6d00a6 100644
--- a/tcp.c
+++ b/tcp.c
@@ -22,8 +22,9 @@
 #include <sys/socket.h>	/* socket connect setsockopt */
 #include <sys/time.h>	/* timeval */
 #include <netdb.h>	/* gethostbyname */
+#include <netinet/in.h>	/* sockaddr_in */
 #include <netinet/tcp.h> /* TCP_NODELAY */
-#include <arpa/inet.h>	/* sockaddr_in inet_addr */
+#include <arpa/inet.h>	/* inet_addr */
 #include <errno.h>	/* errno */
 #include "rdesktop.h"