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-rw-r--r--pkgs/development/interpreters/python/mk-python-derivation.nix5
1 files changed, 5 insertions, 0 deletions
diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index 41efddbb3e0..59510252409 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -165,6 +165,11 @@ let
   # Python packages built through cross-compilation are always for the host platform.
   disallowedReferences = lib.optionals (python.stdenv.hostPlatform != python.stdenv.buildPlatform) [ python.pythonForBuild ];
 
+  # many packages that support python2, may include code
+  # which python2 is not able to compile
+  # mkDerivation hash will not change when passed null attrs
+  dontUsePythonRecompileBytecode = attrs.dontUsePythonRecompileBytecode or (if python.isPy27 then true else null);
+
   meta = {
     # default to python's platforms
     platforms = python.meta.platforms;