anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchgit
   , wrapLisp
   , sbcl
  
positive.code:   ];
  
    buildPhase = ''
      ln -s ${openssl.out}/lib/libcrypto.so.* .
      ln -s ${openssl.out}/lib/libssl.so.* .
      common-lisp.sh --script scripts/build.lisp
    '';
  
    installPhase = ''
      INSTALL_ROOT=$out sh install.sh
    '';
  
    # fixupPhase results in fatal error in SBCL, `Can't find sbcl.core`
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "clpm";
    version = "0.3.6";
  
    src = fetchgit {
      url = "https://gitlab.common-lisp.net/clpm/clpm";
      rev = "v${version}";
      fetchSubmodules = true;
      sha256 = "04w46yhv31p4cfb84b6qvyfw7x5nx6lzyd4yzhd9x6qvb7p5kmfh";
    };
  
    buildInputs = [
  