Re: doc: Mention gnulib putenv module?

[Bruno Haible]

Hi Collin,

> Is there a reason why the Gnulib putenv module isn't mentioned on this
> line or can I apply this diff with a ChangeLog entry?

It is mentioned at the end of this file.

But maybe something could be clarified:
  - Does POSIX still not allow to remove an environment variable using
    this function?
  - On which platforms does the native putenv() not allow to remove an
    environment variable using this function?

I think this is related to very very old shells not having an 'unset'
primitive.

Bruno