message: Update Linux build instructions
diff: @@ -92,6 +92,8 @@ Make sure you've installed the following dependencies:
  - `libc++abi-7-dev` (`libcxxabi-static` on Fedora) or higher
  - `ninja-build`
  - `libxi-dev`
  +- `libxcomposite-dev` (`libXcomposite-devel` on Fedora)
  +- `libxxf86vm-dev` (`libXxf86vm-devel` on Fedora)
  After dependencies have been installed, we highly recommend using the [easy build](#easy-build)
  script.
  