rust-lang/rust — pull request #19065 by jmesmon (2014-11-18 07:01:46+00:00)
Title: Add support for --bindir and remember the relative locations of bindir and libdir vs prefix (ie: sysroot)

Potential downsides:
- right now adds a build dependency on `realpath`, which I'm not sure everyone has, to determine relative directories. It's possible we could substitute something else if this matters.

Upsides:
- `--libdir` now avoids breaking things at runtime if it isn't in one of the expected locations
- config diff between windows and everyone else is now confined to the configure script.