--- a/filecmp.c	2005-04-19 12:22:01.000000000 +0200
+++ b/filecmp.c	2010-12-30 20:23:24.000000000 +0100
@@ -11,6 +11,7 @@
 #include <ctype.h>
 #include <tcl.h>
 #include <sys/fcntl.h>
+#include <unistd.h> /* close() read() */
 
 #define BSIZE		32768
 #define MAXTAGLEN	512	/* max tag length for sanity, < BSIZE */