[m-rev.] posix: environment

[Michael Day]

> > What's wrong with io__get_environment_var?
>
> It requires knowledge of which environment variables are available, which
> you may not have. It is quite possible that you may wish to write code
> that looks through all environment variables for a certain subset (for
...

I'm withdrawing this patch, as it doesn't work on Solaris.

Michael

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