I was hit by this, and created https://github.com/ueno/ruby-gpgme/pull/166. Won't have much time on this topic however.
- Bug#1024651: ruby-gpgme: FTBFS against libgpgme... Andreas Metzler
- Bug#1024651: ruby-gpgme: FTBFS against lib... Mathieu Parent
- Bug#1024651: marked as done (ruby-gpgme: F... Debian Bug Tracking System
