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-rw-r--r--src/nix/command.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/nix/command.hh b/src/nix/command.hh
index 6b34e3881e79..a7863c49f37a 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -5,6 +5,8 @@
 
 namespace nix {
 
+extern std::string programPath;
+
 struct Value;
 class Bindings;
 class EvalState;