Control: tags -1 wontfixWell, I guess it is fair to tag the bug with wontfix. The architecture of libgkl-jni is correctly indicated in the debian/control file, I think it is enough.
Also, with current version (0.8.9+dfsg), the original error message that triggered this bug report is not showing up anymore on arm64, but another one occurs later on during the build, also linked to some missing header...
Best, -- Pierre