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-rw-r--r--pkgs/development/interpreters/python/default.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index d74e017d830..5f13418aa58 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -69,6 +69,7 @@ with pkgs;
               recursivePthLoader
             ;
           };
+          extra = _: {};
           optionalExtensions = cond: as: if cond then as else [];
           python2Extension = import ../../../top-level/python2-packages.nix;
           extensions = lib.composeManyExtensions ((optionalExtensions (!self.isPy3k) [python2Extension]) ++ [ overrides ]);
@@ -77,6 +78,7 @@ with pkgs;
           pkgs.newScope
           otherSplices
           keep
+          extra
           (lib.extends extensions pythonPackagesFun))
         {
           overrides = packageOverrides;