anchor.diff:    nativeBuildInputs = [
       pkg-config
     ];
  +
     checkInputs = [
       gdb numpy ncurses
     ];
  +
     buildInputs = [ glibcLocales ];
     LC_ALL = "en_US.UTF-8";
   
  
positive.code:   # https://github.com/cython/cython/issues/2785
    # Temporary solution
    doCheck = false;
  
  #   doCheck = !stdenv.isDarwin;
  
  
    meta = {
      description = "An optimising static compiler for both the Python programming language and the extended Cython programming language";
  
negative.code: }:
  
  let
    excludedTests = [ "reimport_from_subinterpreter" ]
      # cython's testsuite is not working very well with libc++
      # We are however optimistic about things outside of testsuite still working
      ++ lib.optionals (stdenv.cc.isClang or false) [ "cpdef_extern_func" "libcpp_algo" ]
  