[vram22]

PCRE is a nice library. I read (on its site, IIRC) that it is used for the regex support in Python and some other languages.

I once worked - as part of new product work in an enterprise company - on building the PCRE library as an object file on multiple Unixes from different vendors (like IBM AIX, HP-UX, Solaris, DEC Ultrix, etc.) and also on Windows (including on both 32-bit and 64-bit variants of some of those OSes), using the C compiler toolchain on each of those platforms. I was a bit surprised to see the amount of variation in the toolchain commands and flags (command-line options) across the tools on all those Unixes. But on further thought, knowing about the Unix wars [1] and configure [2], maybe I should not have been surprised.

[1] https://en.wikipedia.org/wiki/Unix_wars

[2] https://en.wikipedia.org/wiki/Configure_script