Impossible de mettre à jour la formule 'macvim' avec Homebrew?

J'ai commencé ma mise à jour à partir d'une sortie vierge brew doctoret puis brew update macvimcela ne fonctionne pas:

brew upgrade macvim                                                                                               
==> Upgrading 1 outdated package, with result:
macvim 7.4-99
==> Upgrading macvim
==> Downloading https://github.com/macvim-dev/macvim/archive/snapshot-99.tar.gz
Already downloaded: /Library/Caches/Homebrew/macvim-7.4-99.tar.gz
==> ./configure --with-features=huge --enable-multibyte --with-macarchs=x86_64 --enable-perlinterp --enable-rubyinterp --enable-tc
Last 15 lines from /Users/meng/Library/Logs/Homebrew/macvim/01.configure:
--enable-rubyinterp
--enable-tclinterp
--with-tlib=ncurses
--with-compiledby=Homebrew
--with-local-dir=/usr/local
--enable-cscope
--enable-pythoninterp

configure: creating cache auto/config.cache
checking whether make sets $(MAKE)... yes
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/private/tmp/macvim20160315-26108-1x1n9dj/macvim-snapshot-99/src':
configure: error: C compiler cannot create executables
See `config.log' for more details

READ THIS: https://git.io/brew-troubleshooting

These open issues may also help:
macvim: disable ruby integration on 10.6 https://github.com/Homebrew/homebrew/pull/40255
macvim fails to build on Yosemite 10.10 with _SC_PHYS_PAGES error https://github.com/Homebrew/homebrew/issues/47026
macvim failed to build on 10.6.8 https://github.com/Homebrew/homebrew/issues/38047

Avez-vous une idée de la façon d'interpréter les erreurs et de la corriger?

• Informations sur clang:

  bash-4.3$ which clang
  /usr/bin/clang
  bash-4.3$ clang
  clang: error: no input files
  bash-4.3$ clang --version
  Apple LLVM version 7.0.2 (clang-700.1.81)
  Target: x86_64-apple-darwin15.3.0
  Thread model: posix
  bash-4.3$
  

• Version de Mac OS X: 10.11.3

• Je n'ai pas trouvé le fichier journal de la bière config.log:

  ~/Library/Logs/Homebrew$ pwd
  /Users/qazwsx/Library/Logs/Homebrew
  ~/Library/Logs/Homebrew$ find . -type f -name config.log
  ./auctex/config.log
  ./diffutils/config.log
  ./emacs/config.log
  ./findutils/config.log
  ./gnu-indent/config.log
  ./gnu-sed/config.log
  ./gnu-tar/config.log
  ./gnu-which/config.log
  ./grep/config.log
  ./gzip/config.log
  ./less/config.log
  ./m4/config.log
  ./mkvtoolnix/config.log
  ./ncurses/config.log
  ./python/config.log
  ./quvi/config.log
  ./screen/config.log
  ./wdiff/config.log