diff --git a/dkpsp/scripts/build-gcc.sh b/dkpsp/scripts/build-gcc.sh
index 851852e..5843c6e 100644
--- a/dkpsp/scripts/build-gcc.sh
+++ b/dkpsp/scripts/build-gcc.sh
@@ -97,6 +97,10 @@ fi
 
 cd $BUILDDIR
 
+unset CFLAGS
+unset CFLAGS_FOR_HOST
+unset LDFLAGS
+
 #---------------------------------------------------------------------------------
 # build and install newlib
 #---------------------------------------------------------------------------------