diff --git a/config.project b/config.project
index f283011..69447d8 100644
--- a/config.project
+++ b/config.project
@@ -31,6 +31,10 @@ mb_pkghome=https://www.gnu.org/software/automake/
 mb_ccenv_create_log=
 mb_ccenv_skip_native=
 
+# compilation environment
+mb_hosted=
+mb_freestanding=
+
 # switches
 mb_default_cflags_common="-std=c99 -D_XOPEN_SOURCE=700"
 mb_default_cflags_common="$mb_default_cflags_common -Ibuild"