As commented in [#8](https://github.com/ghdl/docker/issues/8#issuecomment-510975831), `libgnat` is a dependency of GHDL, but `libgnarl` is not. We should check which is the piece of source code that is making `libgnarl` be added as a dependency.
As commented in #8,
libgnatis a dependency of GHDL, butlibgnarlis not.We should check which is the piece of source code that is making
libgnarlbe added as a dependency.