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-rw-r--r--build2/context.hxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/build2/context.hxx b/build2/context.hxx
index 434b41f..fed6bf1 100644
--- a/build2/context.hxx
+++ b/build2/context.hxx
@@ -275,6 +275,8 @@ namespace build2
extern const variable* var_clean; // [bool] target visibility
+ extern const char var_extension[10]; // "extension"
+
// Current action (meta/operation).
//
// The names unlike info are available during boot but may not yet be