[PATCH build] List environment variables with usage.

[Gaetan Nadon]

On Sat, 2010-08-07 at 13:35 -0400, Trevor Woerner wrote:

> Actually, ACLOCAL, MAKE, and FONTPATH follow the same pattern and I
> was going to add them to the usage() information. In other words,
> defining those in the environment causes the specified commands to run
> instead of the defaults. They replace the default.
> 
> PKG_CONFIG_PATH, LD_LIBRARY_PATH, and PATH don't follow the same
> pattern in that they add to such-named variables; they don't replace
> them. So I wasn't going to add them to the list. But I could add them
> to a separate list.
> 

Correct, their usage is different. Great if can provide a hint on this.
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