Thanks for the PR. For the reference, what system and standard library is causing the problem?

Alpine Linux, which uses the musl libc by Rich Felker.
The musl libc presents many many security and performance advantages, so that was why I opted for it for all the local computers here on the beginning of July.
Unfortunately, there are a few software that use unportable glibc-specific functions.

The good thing is that most of those software are open-source, so we can see where it fails exactly and solve the issues. I'm glad AMPL's mp is such a software.

Unfortunately AMPL itself isn't and there are no binaries for musl libc. I understand though that an open-source model for a company is hard to make work and profit from. In the future, who knows, maybe if musl starts getting more famous AMPL could provide musl binaries... Or even open source it all, although I think that's less likely in the short term.

Anyway, thanks for the help.

Merged, thanks!