Al intentar actualizar osxfuse, aparece el mensaje "Falta la ruta DEVELOPER_DIR

Recientemente he instalado Yosemite, y ahora estoy tratando de actualizar todas mis instalaciones de cerveza ( brew update entonces brew upgrade ). Después de acordarse de hacer xcode-select --install Finalmente he actualizado todas mis instalaciones excepto encfs y osxfuse (encfs depende de osxfuse). Ahora, al intentar actualizar, obtengo los siguientes resultados (todo incluido porque no es tan grande):

 brew upgrade                                                   
==> Upgrading 2 outdated packages, with result:
encfs 1.7.5_1, osxfuse 2.7.1
==> Upgrading encfs
==> Installing encfs dependency: osxfuse
==> Cloning https://github.com/osxfuse/osxfuse.git
Updating /Library/Caches/Homebrew/osxfuse--git
==> Checking out tag osxfuse-2.7.1
==> ./build.sh -t homebrew -f /usr/local/Cellar/osxfuse/2.7.1

OSXFUSEBuildTool()            : supported platforms: 10.9 10.10
OSXFUSEBuildTool()            : building OSXFUSE kernel extension and tools
xcrun: error: missing DEVELOPER_DIR path: 
OSXFUSEBuildTool() failed: xcodebuild cannot build configuration Release.

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

Naturalmente, he ido a la página de solución de problemas, y aún no he podido resolver mis problemas (aunque puede que me haya ayudado a resolver problemas con fórmulas anteriores). Los resultados de brew doctor son:

 brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Broken symlinks were found. Remove them with `brew prune`:
  /usr/local/lib/libosxfuse.la

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/libyices.2.1.0.dylib

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

    fuse4x
    gcc
    ghostscript
    ruby

Warning: Your Xcode (6.0.1) is outdated
Please update to Xcode 6.1.
Xcode can be updated from the App Store.

Los resultados de brew --config son:

 brew --config
HOMEBREW_VERSION: 0.9.5
ORIGIN: https://github.com/Homebrew/homebrew.git
HEAD: b7feb05f247b5cf934991d8035bf44ff6c4180ba
Last commit: 43 minutes ago
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit ivybridge
OS X: 10.10-x86_64
Xcode: 6.0.1
CLT: 6.1.0.0.1.1413057044
couldn't understand kern.osversion `14.0.0'
GCC-4.2: build 5666
Clang: 6.0 build 600
X11: 2.7.7 => /opt/X11
System Ruby: 2.0.0-481
Perl: /usr/bin/perl
Python: /usr/local/bin/python => /usr/local/Cellar/python/2.7.8_2/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Ruby: /Users/benjaminhocking/.rvm/rubies/ruby-2.1.3/bin/ruby

He intentado configurar manualmente DEVELOPER_DIR :

 export DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer

Eso no supuso ninguna diferencia. ¿Alguien tiene alguna sugerencia sobre cómo puedo solucionarlo?