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-rw-r--r--src/nix-env/names.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nix-env/names.hh b/src/nix-env/names.hh
index 0fc9b57d0741..aeb923546fd8 100644
--- a/src/nix-env/names.hh
+++ b/src/nix-env/names.hh
@@ -14,6 +14,7 @@ struct DrvName
     string version;
     unsigned int hits;
 
+    DrvName();
     DrvName(const string & s);
     bool matches(DrvName & n);
 };