diff --git a/tools/post-build.sh b/tools/post-build.sh
new file mode 100644
index 0000000..6f85daa
--- /dev/null
+++ b/tools/post-build.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+FILE=$1
+if [ -z $FILE ]
+then
+    exit 0
+fi
+
+OLD="$FILE.old"
+
+cp -f $FILE $OLD
+
+awk '$0 !~ /#define _BUILD/ { print $0 }
+     $0 ~ /#define _BUILD/ { n = $3 + 1; print $1 " " $2 " " n }' $OLD>$FILE
+
+rm -f $OLD