regexprops-generic. The last one seems to be a mistake, it should be fdl
I seem to recall that the issue there was that regexprops-generic is both documentation and code. Therefore neither GPL nor GFDL work, and dual licensing seems like far too much trouble. The "unlimited" license text would also be ok, but I don't see that it's worth changing. The alloca module seems non-trivial but marked as public domain in the code. If it's still the same alloca, that is how it was originally written and released (independently of GNU), decades ago. k