[Gm2] Installation procedures and paths for third party libraries in gm2

[Roberto Aragón]

Hi, Gaius:

My name is Roberto Aragón and I'm currently developing a C/C++ library
with bindings to GUI toolkits like Xaw, GTK2 and QT5 to be able to
write GUI code in GNU Modula-2.

I'd like to take advice in how third party libraries should integrate
with gm2 tree. I'd like to make easier to the user the installation and
use of the library along with the standard compilation procedures of
GM2 but also using simple makefiles.

I'm writting this question here because I think it would be useful for
other GM2 users in this situation.

Regards,
Roberto