"MP3 export library not found"

Using Homebrew, I’ve installed ffmpeg lib which includes lame. The required .dylib is definitely under /usr/local/Cellar/lame/, yet Audacity somehow can’t load the file and still says

MP3 export library not found

What am I doing wrong?
Screen Shot 2014-04-16 at 18.21.05.png

For Audacity, Lame needs to be built with all of the necessary “hooks”. Builds that do not have these will not be recognised by Audacity.
Try using the Lame installer as described here: http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#lame

Also you can if preferred point the Audacity command-line exporter to arbitrary versions of a “Lame” file (that is, an executable, not a dynamic library). Please see http://manual.audacityteam.org/o/man/exporting_to_an_external_program.html .