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