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-rw-r--r--src/libstore/binary-cache-store.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/binary-cache-store.hh
index de6941561d5e..0020f89eee49 100644
--- a/src/libstore/binary-cache-store.hh
+++ b/src/libstore/binary-cache-store.hh
@@ -170,6 +170,9 @@ public:
 
     ref<FSAccessor> getFSAccessor() override;
 
+    void addSignatures(const Path & storePath, const StringSet & sigs)
+    { notImpl(); }
+
 };
 
 }