Debian and Ubuntu 22 carry qepcad B 1.74, from 2021. It's newer than ours, and might work better e.g, on arm64, cf. #36831

the canonical source is chriswestbrown/qepcad and B.1.74 was introduced in chriswestbrown/qepcad@185cd84

Debian and Fedora fixed more bugs, cf e.g. https://bugs.debian.org/996561 and https://github.com/chriswestbrown/qepcad/pulls

So we can use Debian's tarball from https://packages.debian.org/sid/qepcad