anchor.diff:      sed -i '0,/qemuxml2argvtest/{/qemuxml2argvtest/d;}' tests/meson.build
     '' + optionalString isDarwin ''
       sed -i '/qemucapabilitiestest/d' tests/meson.build
  +    sed -i '/vircryptotest/d' tests/meson.build
     '';
   
   
  
positive.code:       (feat "numactl" isLinux)
        (feat "numad" isLinux)
        (feat "pciaccess" isLinux)
        (feat "polkit" true)
        (feat "readline" true)
        (feat "secdriver_apparmor" isLinux)
        (feat "tests" true)
  
negative.code:         --replace "ggrep" "grep"
  
        substituteInPlace src/util/virpolkit.h \
          --replace '"/usr/bin/pkttyagent"' '"${if isLinux then polkit.bin else "/usr"}/bin/pkttyagent"'
  
        patchShebangs .
      ''
  