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-rw-r--r--libbuild2/config/utility.hxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/libbuild2/config/utility.hxx b/libbuild2/config/utility.hxx
index 2a0909f..7774b68 100644
--- a/libbuild2/config/utility.hxx
+++ b/libbuild2/config/utility.hxx
@@ -143,6 +143,7 @@ namespace build2
// config::module for details.
//
const uint64_t save_commented = 0x01; // Save default value as commented.
+ const uint64_t omit_null = 0x02; // Treat NULL as undefined.
LIBBUILD2_SYMEXPORT void
save_variable (scope& root, const variable&, uint64_t flags = 0);