Hi. I am working to update it but I need some time because some other related ports also need to be updated, and at least one new dependency port need to be created. Thanks!
Unfortunately it is not possible to update devel/gps now. The 2017 version depends on libadalang that depends on the 2017 version of devel/gnatcoll. The gnacoll source code was removed from GitHub ( and from AdaCore page ) because it was broken into three parts ( gnatcoll-core, gnatcoll-bindings, gnatcoll-db ), and those new separated versions fail to add -lgnat and -lgnarl flags where it should ( as I learned on Ravenports ). Thanks!
OK, thanks for the investigation. I'm removing the port now, feel free to re-add it once it is up-to-date again.