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brew upgrade ffmpeg ってやったら　エラー

==> Build Flags
CC: /usr/bin/llvm-gcc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CXX: /usr/bin/llvm-g++ => /usr/llvm-gcc-4.2/bin/llvm-g++-4.2
LD: /usr/bin/llvm-gcc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
CXXFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
MAKEFLAGS: -j2

Error: Failed executing: make install
These existing issues may help you:
https://github.com/mxcl/homebrew/issues/8456
Otherwise, please report the bug:
https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue

最初の方に
==> Upgrading ffmpeg
Warning: Building with LLVM, but this formula is reported to not work with LLVM:

Dies during compilation of motionpixels_tablegen

We are continuing anyway so if the build succeeds, please open a ticket with
the following information: 2335-10.7. So
that we can update the formula accordingly. Thanks!

If it doesn't work you can: brew install --use-gcc

って　--use-gccを　　って出ていた

brew upgrade --use-gcc ffmpeg
==> Upgrading ffmpeg
==> Downloading http://ffmpeg.org/releases/ffmpeg-0.8.6.tar.bz2
File already downloaded in /Users/butcher/Library/Caches/Homebrew
==> ./configure --prefix=/usr/local/Cellar/ffmpeg/0.8.6 --enable-shared --enable
==> make install
/usr/local/Cellar/ffmpeg/0.8.6: 97 files, 55M, built in 4.0 minutes

で無事インストール