diff -up texlive-2007/texk/lacheck/lacheck.lex.lacheck texlive-2007/texk/lacheck/lacheck.lex
--- texlive-2007/texk/lacheck/lacheck.lex.lacheck	2006-01-17 22:41:51.000000000 +0100
+++ texlive-2007/texk/lacheck/lacheck.lex	2008-06-18 14:03:27.000000000 +0200
@@ -117,6 +117,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #ifdef WIN32
 #include <win32lib.h>