mxcl/homebrew — comment on commit 6bcd44fe6283e5cb81d7a6b0cd337ae86220bf7d
File:  line 0
By jacknagel:

As an addendum, there are things where this isn't enough because the build scripts act on the presence of the `.git` directory. The solution there is for upstream to patch their build scripts to also sniff for GIT_DIR.