Not all of these are necessary to run MW... But they're used in code, so should at *least* be in suggest (if not require or require-dev).
We may want to promote some suggest entries too.
Not every one being added will mean admins/dev need to install anything, but some packages do do weird things...
- ext-calendar (code change and docu: PHP configuration | Manual:Installation requirements)
- ext-curl (in suggests)
- ext-gd
- ext-gmp
- ext-mysqli (now in suggests)
- ext-openssl (in suggests)
- ext-pcntl (now in suggests)
- ext-pdo (now in suggests)
- ext-pgsql (now in suggests)
- ext-posix (now in suggests)
- ext-readline (now in suggests)
- ext-simplexml (code change)
- ext-sockets (now in suggests)
- ext-zlib (now in suggests)