anchor.diff:  
   , xlibs, libX11, libxcb, libXcursor, libXext, libXrender, libXi
   , xcbutil, xcbutilimage, xcbutilkeysyms, xcbutilwm, libxkbcommon
  -, fontconfig, freetype, openssl, dbus, glib, udev, libxml2, libxslt, pcre
  -, zlib, libjpeg, libpng, libtiff, sqlite, icu
  +, fontconfig, freetype, openssl, dbus, glib, udev, libxml2, libxslt, pcre16
  +, zlib, libjpeg, libpng, libtiff, sqlite, icu, harfbuzz
   
   , coreutils, bison, flex, gdb, gperf, lndir, ruby
   , python, perl, pkgconfig
  
positive.code: 
    propagatedBuildInputs = [
      xlibs.libXcomposite libX11 libxcb libXext libXrender libXi
      fontconfig freetype openssl dbus.libs glib udev libxml2 libxslt pcre
      zlib libjpeg libpng libtiff sqlite icu
      xcbutil xcbutilimage xcbutilkeysyms xcbutilwm libxkbcommon
    ]
    # Qt doesn't directly need GLU (just GL), but many apps use, it's small and
  
negative.code:     -system-zlib
      -system-libpng
      -system-libjpeg
      -system-harfbuzz
      -system-xcb
      -system-xkbcommon
      -system-pcre
      -openssl-linked
      -dbus-linked
  
  