The results of various combinations of brew install boost with openmpi and clang support. So far, mpi works but clang does not.

brew-boost-output

┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew doctor
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
    /usr/local/lib/libmacfuse_i32.2.dylib
    /usr/local/lib/libmacfuse_i64.2.dylib
    /usr/local/lib/libosxfuse_i32.2.dylib
    /usr/local/lib/libosxfuse_i64.2.dylib

Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .la files:
    /usr/local/lib/libosxfuse_i32.la
    /usr/local/lib/libosxfuse_i64.la

Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
    /usr/local/lib/pkgconfig/osxfuse.pc
┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew uninstall boost
Uninstalling /usr/local/Cellar/boost/1.54.0...
┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew --config
HOMEBREW_VERSION: 0.9.4
ORIGIN: https://github.com/mxcl/homebrew.git
HEAD: 94da753a7390f7b95b6d92516d162afada74b69e
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit ivybridge
OS X: 10.8.4-x86_64
Xcode: 5.0 => /Applications/Xcode5-DP.app/Contents/Developer
CLT: 5.0.0.0.1.1372877146
LLVM-GCC: build 2336
Clang: 5.0 build 500
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/bin/ruby => /usr/local/Cellar/ruby/2.0.0-p247/bin/ruby
┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew doctor
Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
    /usr/local/lib/libmacfuse_i32.2.dylib
    /usr/local/lib/libmacfuse_i64.2.dylib
    /usr/local/lib/libosxfuse_i32.2.dylib
    /usr/local/lib/libosxfuse_i64.2.dylib

Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .la files:
    /usr/local/lib/libosxfuse_i32.la
    /usr/local/lib/libosxfuse_i64.la

Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
    /usr/local/lib/pkgconfig/osxfuse.pc

Warning: Some installed formula are missing dependencies.
You should `brew install` the missing dependencies:

    brew install boost

Run `brew missing` for more details.
┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew --config
HOMEBREW_VERSION: 0.9.4
ORIGIN: https://github.com/mxcl/homebrew.git
HEAD: 94da753a7390f7b95b6d92516d162afada74b69e
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit ivybridge
OS X: 10.8.4-x86_64
Xcode: 5.0 => /Applications/Xcode5-DP.app/Contents/Developer
CLT: 5.0.0.0.1.1372877146
LLVM-GCC: build 2336
Clang: 5.0 build 500
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/bin/ruby => /usr/local/Cellar/ruby/2.0.0-p247/bin/ruby
┌─[getchell][Hapkido][±][master ✓][/usr/local/share]
└─▪ brew install boost --with-c++11 2>&1
==> Downloading http://downloads.sourceforge.net/project/boost/boost/1.54.0/boost_1_54_0.tar.bz2
Already downloaded: /Library/Caches/Homebrew/boost-1.54.0.tar.bz2
==> Downloading patches
######################################################################## 100.0%
######################################################################## 100.0%
######################################################################## 100.0%
######################################################################## 100.0%
==> Patching
patching file libs/coroutine/build/Jamfile.v2
patching file boost/date_time/local_time/custom_time_zone.hpp
patching file boost/log/utility/once_block.hpp
patching file boost/thread/win32/thread_primitives.hpp
==> ./bootstrap.sh --prefix=/usr/local/Cellar/boost/1.54.0 --libdir=/usr/local/Cellar/boost/1.54.0/lib --with-toolset=cl
==> ./b2 --prefix=/usr/local/Cellar/boost/1.54.0 --libdir=/usr/local/Cellar/boost/1.54.0/lib -d2 -j8 --layout=tagged --u
    cp "bin.v2/libs/wave/build/clang-darwin-4.2.1/release/link-static/libboost_wave.a"  "/usr/local/Cellar/boost/1.54.0/lib/libboost_wave.a"

...failed updating 16 targets...
...skipped 8 targets...
...updated 12363 targets...

READ THIS: https://github.com/mxcl/homebrew/wiki/troubleshooting

These open issues may also help:
    https://github.com/mxcl/homebrew/issues/22083
    https://github.com/mxcl/homebrew/issues/21824