anchor.diff:  
     buildInputs = [ python3 notmuch ];
   
  -  GOFLAGS="-tags=notmuch";
  -
     buildPhase = "
       runHook preBuild
       # we use make instead of go build
  
positive.code: 
    installPhase = ''
      runHook preInstall
      make PREFIX=$out install
      wrapPythonProgramsIn $out/share/aerc/filters "$out $pythonPath"
      runHook postInstall
    '';
  
negative.code:     license = licenses.mit;
      platforms = platforms.unix;
    };
  }
  