gistfile1.txt

CC	libavcodec/lpc.o
CC	libavcodec/lsp.o
CC	libavcodec/lzw.o
CC	libavcodec/lzwenc.o
CC	libavcodec/mace.o
CC	libavcodec/mdct_fixed.o
CC	libavcodec/mdct_float.o
CC	libavcodec/mdec.o
CC	libavcodec/mimic.o
CC	libavcodec/mjpeg.o
CC	libavcodec/mjpeg2jpeg_bsf.o
CC	libavcodec/mjpeg_parser.o
CC	libavcodec/mjpega_dump_header_bsf.o
CC	libavcodec/mjpegbdec.o
CC	libavcodec/mjpegdec.o
CC	libavcodec/mjpegenc.o
CC	libavcodec/mlp.o
CC	libavcodec/mlp_parser.o
CC	libavcodec/mlpdec.o
CC	libavcodec/mlpdsp.o
CC	libavcodec/mmvideo.o
CC	libavcodec/motion_est.o
HOSTCC	libavcodec/motionpixels_tablegen.o
In file included from libavcodec/motionpixels_tablegen.c:27:
libavcodec/motionpixels_tablegen.h: In function 'mp_yuv_to_rgb':
libavcodec/motionpixels_tablegen.h:33: error: initializer element is not computable at load time
make: *** [libavcodec/motionpixels_tablegen.o] Error 1
make: *** Waiting for unfinished jobs....
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/ffmpeg.rb#L60
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: a34fe38e22a45fe15e8866e2479cc330eb0ab33a
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: quad-core 64-bit arrandale
OS X: 10.7
Kernel Architecture: x86_64
Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 4.2
GCC-4.0: N/A 
GCC-4.2: build 5666 
LLVM: build 2335 
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/cc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CXX: /usr/bin/c++ => /usr/llvm-gcc-4.2/bin/llvm-g++-4.2
LD: /usr/bin/cc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CFLAGS: -O3 -w -pipe
CXXFLAGS: -O3 -w -pipe
MAKEFLAGS: -j4

Error: Failed executing: make install 
Please report this bug: https://github.com/mxcl/homebrew/wiki/Checklist-before-filing-a-new-issue

Also try:
  `brew doctor` to check your setup for common problems.

I am getting the same issue, using XCode 4.1 Build 4B70l