brew install -v $FORMULA output while install HEAD of openocd

openocd head install problem

Warning: open-ocd already installed
==> Installing open-ocd
==> Cloning git://openocd.git.sourceforge.net/gitroot/openocd/openocd
Updating /Users/nmartin/Library/Caches/Homebrew/open-ocd--git
git remote set-url origin git://openocd.git.sourceforge.net/gitroot/openocd/openocd
git fetch origin
git reset --hard origin/HEAD
HEAD is now at c59a441 stlink-v1: fix memory writes
git checkout-index -a -f --prefix=/private/tmp/homebrew-open-ocd-HEAD-0cPH/
git submodule init
Submodule 'jimtcl' () registered for path 'jimtcl'
Submodule 'tools/git2cl' () registered for path 'tools/git2cl'
git submodule update
git submodule --quiet foreach --recursive git checkout-index -a -f "--prefix=/private/tmp/homebrew-open-ocd-HEAD-0cPH/$path/"
==> ./configure --enable-maintainer-mode --prefix=/usr/local/Cellar/open-ocd/HEAD
./configure --enable-maintainer-mode --prefix=/usr/local/Cellar/open-ocd/HEAD
==> Exit Status: 1
http://github.com/mxcl/homebrew/blob/master/Library/Formula/open-ocd.rb#L90
==> Environment
HOMEBREW_VERSION: 0.8.1
HEAD: 8c0ff06f2a7a9b4d38a4f795990d723444c56cd4
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
Hardware: dual-core 64-bit penryn
OS X: 10.7.3
Kernel Architecture: x86_64
Xcode: 4.3
GCC-4.0: N/A
GCC-4.2: build 5666
LLVM: build 2336
Clang: 3.1 build 318
MacPorts or Fink? false
X11: /usr/X11
System Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Which Perl:   /usr/bin/perl
Which Python: /Library/Frameworks/Python.framework/Versions/2.7/bin/python => /Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Which Ruby:   /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
==> Build Flags
CC: /usr/bin/clang
CXX: /usr/bin/clang++ => /usr/bin/clang
LD: /usr/bin/clang
CFLAGS: -Os -w -pipe -march=native -Qunused-arguments
CXXFLAGS: -Os -w -pipe -march=native -Qunused-arguments
MAKEFLAGS: -j2

Error: Failed executing: ./configure --enable-maintainer-mode --prefix=/usr/local/Cellar/open-ocd/HEAD
If `brew doctor' does not help diagnose the issue, please report the bug:
    https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
We saved the configure log, please gist it if you report the issue:
    ~/Library/Logs/Homebrew/config.log