anchor.diff:      # Recording the creation timestamps introduces indeterminism to the build
       sed -i '/Created: .*/d' electrum/gui/qt/icons_rc.py
       sed -i "s|name = 'libzbar.*'|name='${zbar}/lib/libzbar.so'|" electrum/qrscanner.py
  +    substituteInPlace ./electrum/ecc_fast.py --replace libsecp256k1.so.0 ${secp256k1}/lib/libsecp256k1.so.0
     '';
   
     postInstall = ''
  
positive.code:     qrcode
      requests
      tlslite-ng
      typing
  
      # plugins
      keepkey
  
negative.code:       --replace "Exec=electrum %u" "Exec=$out/bin/electrum %u"
    '';
  
    checkInputs = with python3Packages; [ pytest ];
  
    checkPhase = ''
      py.test electrum/tests
      $out/bin/electrum help >/dev/null
    '';
  
  