portage only provides 3.5 but 3.7 is the current version
Upstream does not mark their releases with proper version numbers, so we cannot distinguish between the 3.5 and 3.7 releases. I have hard-masked our 3.5 version, as it is impossible to tell whether it is the 3.5 or 3.7 version without running the program, and some users may already have installed 3.7, other 3.5 from the same ebuild. Please request upstream to properly version their files, and we'll re-include it (both 3.5 and 3.7, if available) in our tree. When upstream has fixed this, please reopen the bug.