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-rw-r--r--libbuild2/in/init.cxx5
1 files changed, 5 insertions, 0 deletions
diff --git a/libbuild2/in/init.cxx b/libbuild2/in/init.cxx
index 6cd2f96..18071f8 100644
--- a/libbuild2/in/init.cxx
+++ b/libbuild2/in/init.cxx
@@ -59,6 +59,11 @@ namespace build2
// unknown substitutions as is.
//
vp.insert<string> ("in.substitution");
+
+ // Fallback value to use for NULL value substitutions. If unspecified,
+ // NULL substitutions are an error.
+ //
+ vp.insert<string> ("in.null");
}
// Register target types.