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-rw-r--r--src/libstore/derivations.hh4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libstore/derivations.hh b/src/libstore/derivations.hh
index 6b7c3e6ab189..703410b92552 100644
--- a/src/libstore/derivations.hh
+++ b/src/libstore/derivations.hh
@@ -85,7 +85,9 @@ extern DrvHashes drvHashes;
 typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
 DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
 
-Path makeDrvPathWithOutputs(const Path & drvPath, std::set<string> outputs);
+Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);
+
+bool wantOutput(const string & output, const std::set<string> & wanted);
 
 
 }