A.34 library(prolog_pack): A package manager for Prolog
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Availability::- use_module(library(prolog_pack)).
Source[nondet,multifile]environment(-Name, -Value)
Hook to define the environment for building packs. This Multifile hook extends the process environment for building foreign extensions. A value provided by this hook overrules defaults provided by def_environment/2. In addition to changing the environment, this may be used to pass additional values to the environment, as in: 
prolog_pack:environment('USER', User) :-
    getenv('USER', User).
Name is an atom denoting a valid variable name
Value is either an atom or number representing the value of the variable.
ClioPatria (version V3.1.1-40-g9d9e003)