Source: gpr Severity: serious Version: 0.15deb-2gpr does not seem to be used a lot and is dead upstream. The Debian version is essentially a fork that is also not updated since 2011.
I intend to file a RM bug. If you have any reasons to keep it in Debian please voice them here.To get people's attention, I am filing as a serious bug and will reassign to the FTP team when the package is autoremoved from testing.