mxcl/homebrew — comment on commit 2eabe2cbc84649696aeb6fa842a70f3794955597
File:  line 0
By jacknagel:

Turns out that this introduces a regression in the case where two formula share a subdirectory, e.g. "include/openexr"; Homebrew should force the directory shared, but since Keg#unlink looks for symlinks relative to the keg, it can inadvertently remove an identical directory symlink instead.

Will revert for the time being.