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-rw-r--r--src/libstore/derivations.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 974de78c58d5..9717a81e469c 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -117,4 +117,6 @@ struct Sink;
 Source & readDerivation(Source & in, Store & store, BasicDerivation & drv);
 Sink & operator << (Sink & out, const BasicDerivation & drv);
 
+std::string hashPlaceholder(const std::string & outputName);
+
 }