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-rw-r--r--src/libutil/compute-levels.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libutil/compute-levels.hh b/src/libutil/compute-levels.hh
index 8ded295f9..093e7a915 100644
--- a/src/libutil/compute-levels.hh
+++ b/src/libutil/compute-levels.hh
@@ -1,3 +1,6 @@
+#pragma once
+///@file
+
#include "types.hh"
namespace nix {