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-rw-r--r--nix/libstore/builtins.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/nix/libstore/builtins.hh b/nix/libstore/builtins.hh
index 0c6db651ab..79171fcb6c 100644
--- a/nix/libstore/builtins.hh
+++ b/nix/libstore/builtins.hh
@@ -38,4 +38,7 @@ namespace nix {
     /* Return the built-in builder called BUILDER, or NULL if none was
        found.  */
     derivationBuilder lookupBuiltinBuilder(const std::string &builder);
+
+    /* Return the list of supported built-in builder names.  */
+    std::list<std::string> builtinBuilderNames();
 }