On 2021-09-27 10:07, Joshua Rice via cctalk wrote (in part):
However, much of the "Linux" software is in fact POSIX software, and
can quite easily be ported between Linux and other *NIX-likes, such as
Solaris, macOS and the *BSD family.
I cannot agree.? Many developers ensure that their software runs under
their particular distribution and then call it POSIX. Porting to UNIX
systems, such as Solaris or macOS, can be difficult and tedious.? (Of
course, this is not a Linux issue.)