--- src/isotetra.c.orig	Thu Nov 21 16:27:11 2002
+++ src/isotetra.c	Thu Nov 21 16:27:34 2002
@@ -18,6 +18,7 @@
  */
 
 #include <math.h>
+#include <string.h>
 #include <gts.h>
 #ifdef NATIVE_WIN32
 # include <memory.h>