diff -r 9e386a530bdf -r ef09f80e911e test/make/configure.vm
--- a/test/make/configure.vm	Sun Sep 03 12:36:53 2023 +0200
+++ b/test/make/configure.vm	Sun Sep 03 12:38:49 2023 +0200
@@ -304,7 +304,7 @@
 . make/toolchain.sh
 
 # add user specified flags to config.mk
-echo >> "$TEMP_DIR/config.mk"
+echo "# project specific flags" >> "$TEMP_DIR/config.mk"
 if [ -n "${ENV_CFLAGS}" ]; then
     echo "CFLAGS += $ENV_CFLAGS" >> "$TEMP_DIR/config.mk"
 fi