> ... Anything more elaborate should probably go into setup.h (or
setup-os400.h).

File lib/setup-os400.c has been created to hold all OS400-specific
declarations that should not be in lib/config-os400.h.

> The buffer assumptions in makeOS400IconvCode() (and elsewhere) should
be documented.

A comment has been added and array arguments length put in #define

> ... the OS/400 support is not thread safe...

Fully threadsafe now.

> The list of tests in make-tests.sh is already out of date and missing
tests.

make-tests.sh now uses Makefile.am to determine what and how to compile

Some errors in RPG definition file fixed.
Thanks again for your remarks
Patrick