Control: tags -1 patch Let me know if you want a complete debdiff. But the basic idea can be borrowed from:
https://salsa.debian.org/debian/dumpasn1/-/blob/master/debian/rules#L20 So help2man is called during build time: override_dh_install: debian/dumpasn1.1 debian/dumpasn1.1: debian/dumpasn1.1.in [...]help2man[...]
