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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 2f87b9c776..8707182ed1 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -95,6 +95,7 @@ public:
 
     const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName,
         sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls;
+    Symbol sDerivationNix;
 
     /* If set, force copying files to the Nix store even if they
        already exist there. */