brew doctor and brew --config output

gistfile1.txt

afon-MacBook-Pro:local afon$ brew doctor
Your system is ready to brew.
afon-MacBook-Pro:local afon$ brew --config
HOMEBREW_VERSION: 0.9.4
ORIGIN: https://github.com/mxcl/homebrew.git
HEAD: 5a9478e5a85475ac664671f1013cf116691103ff
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit ivybridge
OS X: 10.8.4-x86_64
Xcode: 4.6.3
CLT: 4.6.0.0.1.1365549073
LLVM-GCC: build 2336
Clang: 4.2 build 425
X11: 2.7.4 => /opt/X11
System Ruby: 1.8.7-358
Perl: /usr/bin/perl
Python: /usr/local/bin/python => /usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Ruby: /usr/local/opt/ruby/bin/ruby => /usr/local/Cellar/ruby/2.0.0-p247/bin/ruby
afon-MacBook-Pro:local afon$

afon-MacBook-Pro:local afon$ HOMEBREW_MAKE_JOBS=1 VERBOSE=1 brew upgrade macvim 2>&1
==> Upgrading 1 outdated package, with result:
macvim 7.4-70
==> Upgrading macvim
rm /usr/local/bin/vimex
rm /usr/local/bin/vimdiff
rm /usr/local/bin/vim
rm /usr/local/bin/view
rm /usr/local/bin/vi
rm /usr/local/bin/mvimex
rm /usr/local/bin/mvimdiff
rm /usr/local/bin/mvim
rm /usr/local/bin/mview
rm /usr/local/bin/gvimex
rm /usr/local/bin/gvim
rm /usr/local/bin/gview
==> Downloading https://github.com/b4winckler/macvim/archive/snapshot-70.tar.gz
Already downloaded: /Library/Caches/Homebrew/macvim-7.4-70.tar.gz
tar xf /Library/Caches/Homebrew/macvim-7.4-70.tar.gz
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/vimex vimex
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/vimdiff vimdiff
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/vim vim
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/view view
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/vi vi
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/mvimex mvimex
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/mvimdiff mvimdiff
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/mvim mvim
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/mview mview
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/gvimex gvimex
Skipping; already exists: /usr/local/bin/gvimdiff
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/gvim gvim
ln -s ../Cellar/macvim/7.4b-BETA-69/bin/gview gview
ln -s ../../Cellar/macvim/7.4b-BETA-69 macvim
ln -s ../Cellar/macvim/7.4b-BETA-69 macvim
Error: undefined local variable or method `arch' for macvim:Macvim
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/troubleshooting
/usr/local/Library/Formula/macvim.rb:33:in `install'
/usr/local/Library/Homebrew/build.rb:170:in `install'
/usr/local/Library/Homebrew/formula.rb:239:in `brew'
/usr/local/Library/Homebrew/formula.rb:600:in `stage'
/usr/local/Library/Homebrew/extend/fileutils.rb:21:in `mktemp'
/usr/local/Library/Homebrew/formula.rb:596:in `stage'
/usr/local/Library/Homebrew/formula.rb:234:in `brew'
/usr/local/Library/Homebrew/build.rb:149:in `install'
/usr/local/Library/Homebrew/build.rb:43:in `main'
/usr/local/Library/Homebrew/build.rb:12
/usr/local/Library/Formula/macvim.rb:98
afon-MacBook-Pro:local afon$