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-rw-r--r--src/libstore/local-store.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstore/local-store.hh b/src/libstore/local-store.hh
index 8f4ed8fc82ba..83cb87d451a7 100644
--- a/src/libstore/local-store.hh
+++ b/src/libstore/local-store.hh
@@ -138,6 +138,8 @@ Path queryDeriver(const Transaction & txn, const Path & path);
 /* Delete a value from the nixStore directory. */
 void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
 
+MakeError(PathInUse, Error);
+
 void verifyStore(bool checkContents);
 
 /* Whether we are in build users mode. */