Warning: Your Xcode (4.6) is outdated
Please install Xcode 4.6.3.
==> Downloading http://downloads.sourceforge.net/gpac/gpac-0.5.0.tar.gz
Already downloaded: /Library/Caches/Homebrew/gpac-0.5.0.tar.gz
==> ./configure --disable-wx --prefix=/usr/local/Cellar/gpac/0.5.0 --mandir=/usr/local/Cellar/gpac/0.5.0/share/man --extra-cflags=-I/opt/X11/include --extra-ldflags=-L/opt/X11/lib
==> make
                         ^
2 errors generated.
make[2]: *** [ffmpeg_decode.o] Error 1
make[1]: *** [plugs] Error 2
make: *** [all] Error 2

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

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:277:in `open_http': 404 Not Found (OpenURI::HTTPError)
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:616:in `buffer_open'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:164:in `open_loop'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:162:in `catch'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:162:in `open_loop'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:132:in `open_uri'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:518:in `open'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open-uri.rb:26:in `open'
	from /usr/local/Library/Homebrew/utils.rb:249:in `open'
	from /usr/local/Library/Homebrew/utils.rb:266:in `each_issue_matching'
	from /usr/local/Library/Homebrew/utils.rb:278:in `issues_for_formula'
	from /usr/local/Library/Homebrew/exceptions.rb:166:in `issues'
	from /usr/local/Library/Homebrew/exceptions.rb:194:in `dump'
	from /usr/local/Library/brew.rb:122