anchor.diff:  , uhd
   , SDL
   , gsl
  +, soapysdr
   , libsodium
   , libsndfile
   , libunwind
  
positive.code:     src
      nativeBuildInputs
      buildInputs
      disallowedReferences
      stripDebugList
      doCheck
  
negative.code:   } // lib.optionalAttrs (hasFeature "gr-qtgui" features) {
      inherit (libsForQt5) qwt;
    };
  
    postInstall = shared.postInstall
      # This is the only python reference worth removing, if needed.
      + lib.optionalString (!hasFeature "python-support" features) ''
        ${removeReferencesTo}/bin/remove-references-to -t ${python} $out/lib/cmake/gnuradio/GnuradioConfig.cmake
        ${removeReferencesTo}/bin/remove-references-to -t ${python} $(readlink -f $out/lib/libgnuradio-runtime.so)
  