I managed to install the GNAT compiler from libre.adacore.com on a OS X v10.6.8 (Snow Leopard). I also would like to install the Gnat Programming Studio (GPS) environment. I tried different things, but none of them worked and I didn't find any exhaustive explanation.
How can I perform (possibly step by step) the installation of GPS on a OS X operating system?
I propose my solution for Mac OS X v10.6.8 (Snow Leopard).
Since I had problems with the adagpl-2014 version, I downloaded the adagpl-2012 version.
To install it, open the terminal in Utilities and navigate to the folder
/x86_64-darwin/adagpl-2012/gnatgpl
and launch the file doinstall with the command sudo ./doinstall.
Be sure to wait until the installation ends. After that, navigate to the subfolder bin and launch the GPS file with ./gps.