mozilla/rust — pull request #9760 by Heather (2013-10-08 02:34:14+00:00)
Title: support for GNU configure syntax

Re-created: https://github.com/mozilla/rust/pull/9565

t will be useful for unix systems, some package managers and external tools that is passing / maybe looking for GNU configure syntax options.

One of related bugs: #5138

Also that could be useful in future if project will really install man pages / other stuff using those variables.