Source: nordlicht Version: 0.4.4-1 Tags: patch User: debian-...@lists.debian.org Usertags: arm64
It failed to build on ARM architectures and presumably on other architectures with plain char unsigned: https://buildd.debian.org/status/package.php?p=nordlicht&suite=sid There's a "char c" in main.c. Change it to "int c", because poptGetNextOpt returns int. That's your patch.
