Comment 12 for bug 1473801

@rimorob
Assuming you use homebrew, try the following:
* Update homebrew
   `brew update`
*updating installed libraries
 `brew upgrade`
*git pull latest changes from mixxx/master
*Clean scons
 `scons -p`
*Run scons
 `scons`

If there are still errors, try deleting the temp build files
/osx64_build
/.sconf_temp
/.sconsign.branch
/.sconsign.dblite

Then build ( On OSX Mavericks/Yosemite) with
`scons stdlib=libc++`