diff --git a/config.project b/config.project
index f581e5f..d5d6126 100644
--- a/config.project
+++ b/config.project
@@ -29,6 +29,10 @@ mb_pkglibs=
 mb_ccenv_create_log=
 mb_ccenv_skip_native=
 
+# compilation environment
+mb_hosted=
+mb_freestanding=
+
 # switches
 mb_default_cflags_common="-std=c99 -ffreestanding"
 mb_default_cflags_common="$mb_default_cflags_common -I\$(SOURCE_DIR)/src/internal"