anchor.diff:      libXpm
       libXrandr
       libjpeg
  +    libogg
       libpng
       libpthreadstubs
       libsndfile
       libtiff
       libxcb
       mkfontdir
  -    pcre
  +    pcre2
     ];
   
     cmakeFlags = [
  
positive.code: 
    buildInputs = [
      expat
      fontconfig
      freetype
      fribidi
  
negative.code: 
    # install legacy themes
    postInstall = ''
      cp -r ../lib/themes/{gtk2,Natural,nice,nice2,warp3,warp4,yellowmotif} \
        $out/share/icewm/themes/
    '';
  
    meta = with lib; {
  