This is a more flexible variant of
and it allows creating an custom API in the package that
pkgconfig for its configuration.
Parameters to set, they should be all named.
An environment, typically belonging to a package.
This function is identical to
set_config, but it allows
supplying the environment that is used as the package the configuration
is set for. This makes it possible to create an API for setting
(and getting) configuration parameters.
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