wait and waitpid

[Tomas Hlavaty]

Hi,

my gforth does not seem to have the words wait (and waitpid, which is
easier to search) defined.  Those words are present in
wordlibs/unixlib.pri.

What is the idea behind those pri files?

   netlib/netlib.pri
   wordlibs/dlerror.pri
   wordlibs/time.pri
   wordlibs/unixlib.pri

How can I "require" wordlibs/unixlib.pri?

Do I need to specify something during gforth compilation?

Why is it different from, for example, require unix/libc.fs?

Why does unix/libc.fs contain fork but not wait and waitpid?

Thanks in advance

Tomas