anchor.diff:    };
   
     nativeBuildInputs = [
  -    python2 pkgconfig autoconf automake cmake nasm libtool m4
  +    python2 pkgconfig autoconf automake libtool m4
     ] ++ lib.optionals useGtk [ intltool wrapGAppsHook ];
   
     buildInputs = [
  
positive.code:   # look at ./make/configure.py search "enable_nvenc"
      ++ lib.optional stdenv.isLinux nv-codec-headers;
  
    # NOTE: 2018-12-25: v1.2.0 now requires cmake dep
    # (default distribution bundles&builds 3rd party libs),
    # don't trigger cmake build
    dontUseCmakeConfigure = true;
    # cp: cannot create regular file './internal_defaults.json': File exists
    enableParallelBuilding = false;
  
    preConfigure = ''
      patchShebangs scripts
  
  
negative.code:     # Force using nixpkgs dependencies
      sed -i '/MODULES += contrib/d' make/include/main.defs
      sed -i '/PKG_CONFIG_PATH=/d' gtk/module.rules
      sed -e 's/^[[:space:]]*\(meson\|ninja\|nasm\)[[:space:]]*= ToolProbe.*$//g' \
          -e '/    ## Additional library and tool checks/,/    ## MinGW specific library and tool checks/d' \
          -i make/configure.py
    '';
  
    configureFlags = [
  