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-rw-r--r--pkgs/development/interpreters/python/pypy/default.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkgs/development/interpreters/python/pypy/default.nix b/pkgs/development/interpreters/python/pypy/default.nix
index a5ba4983e43..1f229c7d34e 100644
--- a/pkgs/development/interpreters/python/pypy/default.nix
+++ b/pkgs/development/interpreters/python/pypy/default.nix
@@ -84,6 +84,9 @@ in with passthru; stdenv.mkDerivation rec {
   ];
 
   postPatch = ''
+    substituteInPlace lib_pypy/pypy_tools/build_cffi_imports.py \
+      --replace "multiprocessing.cpu_count()" "$NIX_BUILD_CORES"
+
     substituteInPlace "lib-python/${if isPy3k then "3/tkinter/tix.py" else "2.7/lib-tk/Tix.py"}" --replace "os.environ.get('TIX_LIBRARY')" "os.environ.get('TIX_LIBRARY') or '${tix}/lib'"
 
     sed -i "s@libraries=\['sqlite3'\]\$@libraries=['sqlite3'], include_dirs=['${sqlite.dev}/include'], library_dirs=['${sqlite.out}/lib']@" lib_pypy/_sqlite3_build.py