- Replace original June 1991 GPLv2 with February 1999 (post-LGPLv2.1) GPLv2
- Add LICENSES/* and .reuse/dep5 (REUSE 3.0 compliant)
- Add references to the codeberg repository
- Add ./configure for Linux, FreeBSD, OpenBSD, NetBSD, Solaris, macOS, Cygwin