anchor.diff:      sha256 = "0jkmaw678njqgkflzj9g374yk1mci8yqvsxkrqzlifn6bwhwb7ci";
     };
   
  +  # excludes development artifacts from install, will be included in next release
  +  patches = [
  +    (fetchpatch {
  +      url = "https://github.com/Boolector/boolector/commit/4d240436e34e65096671099766344dd9126145b1.patch";
  +      sha256 = "1girsbvlhkkl1hldl2gsjynwc3m92jskn798qhx0ydg6whrfgcgw";
  +    })
  +  ];
  +
     postPatch = ''
       sed s@REPLACEME@file://${gtest.src}@ ${./cmake-gtest.patch} | patch -p1
     '';
  
positive.code: { stdenv, fetchFromGitHub, lib, python3
  , cmake, lingeling, btor2tools, gtest, gmp
  }:
  
  
negative.code:   cmakeFlags =
      [ "-DBUILD_SHARED_LIBS=ON"
        "-DUSE_LINGELING=YES"
      ] ++ (lib.optional (gmp != null) "-DUSE_GMP=YES");
  
    checkInputs = [ python3 ];
    doCheck = true;
    preCheck =
      let var = if stdenv.isDarwin then "DYLD_LIBRARY_PATH" else "LD_LIBRARY_PATH";
      in
        # tests modelgen and modelgensmt2 spawn boolector in another processes and
        # macOS strips DYLD_LIBRARY_PATH, hardcode it for testing
        stdenv.lib.optionalString stdenv.isDarwin ''
          cp -r bin bin.back
          install_name_tool -change libboolector.dylib $(pwd)/lib/libboolector.dylib bin/boolector
        '' + ''
          export ${var}=$(readlink -f lib)
          patchShebangs ..
        '';
  
    postCheck = stdenv.lib.optionalString stdenv.isDarwin ''
      rm -rf bin
      mv bin.back bin
    '';
  
    # this is what haskellPackages.boolector expects
    postInstall = ''
      cp $out/include/boolector/boolector.h $out/include/boolector.h
      cp $out/include/boolector/btortypes.h $out/include/btortypes.h
    '';
  
    meta = with stdenv.lib; {
      description = "An extremely fast SMT solver for bit-vectors and arrays";
      homepage    = "https://boolector.github.io";
      license     = licenses.mit;
      platforms   = with platforms; linux ++ darwin;
      maintainers = with maintainers; [ thoughtpolice ];
    };
  }
  