$NetBSD$

Fix 64-bit build.

--- launch/camlexec.c~	1996-11-25 10:03:46.000000000 -0500
+++ launch/camlexec.c	2008-09-04 21:22:57.000000000 -0400
@@ -1,3 +1,6 @@
+#include <string.h>
+#include <unistd.h>
+
 #ifdef MSDOS
 char * runtime_name = "camlrun.exe";
 char * errmsg = "Cannot exec camlrun.exe.\n";
