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-rw-r--r--src/libstore/globals.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index cef4f704e6..7f88d5c53b 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -33,6 +33,10 @@ extern bool keepFailed;
    of the same goal) fails. */
 extern bool keepGoing;
 
+/* Whether, if we cannot realise the known closure corresponding to a
+   derivation, we should try to normalise the derivation instead. */
+extern bool tryFallback;
+
 /* Verbosity level for build output. */
 extern Verbosity buildVerbosity;