An update to this ancient bug: Debian is still on version 4.2.8, released in 2008, and is including this antique version with Stretch. Upstream is now on 4.8.8, released in Feb 2017. It looks as though Fedora has version 4.8.8, packaged under the name "gambit-c", with "aarch64" (~ arm64) and "armv7hl" (~ armhf) among its architectures.