diff --git a/build/buildlib-freertos b/build/buildlib-freertos
old mode 100644
new mode 100755
index c3df48f0..68e9043a
--- a/build/buildlib-freertos
+++ b/build/buildlib-freertos
@@ -1,3 +1,7 @@
+#!/bin/sh
+
+rm config.cache config.status -f
+
 ./configure \
 --disable-shared                           \
 --enable-static                            \