Install gnat by running the following commands: ./doconfig The above script will ask you how and where you would like to install gnat. To avoid conflicts with the system gcc, the package will be installed in a separate directory, that can later be removed from the system. In response to the questions asked by the doconfig script, enter 3 in response to the first question and /opt/gnat in response to the second question. To finish the install, run ./doinstall The gnat compiler can be invoked by executing the gcc binary installed by the above script. To avoid conflicts with the system gcc, we will rename the gcc command. cd /opt/gnat/bin && mv gcc gnatgcc && cd real && mv gcc gnatgcc