Developers: CVS Makefile question

[Wayne_Johnson]

I'm adding a subdirectory for MVS platform dependent code (kind of line the
windows-NT directory).  The problem I've run into is that the mvs/ directory
needs to be build before src/, so that the platform dependent code is compiled
before the link in src/.

If I put mvs in with USOURCE_SUBDIRS, it gets built right, but what about other
platforms.

How do the other platforms work it?