I want to add libboost_filesystem.dylib to my Xcode target as a library to link to, but Boost is installed in /opt/local/lib.
/opt is hidden and not accessible from the open panel, so I cannot select the dylib:

How can I add the library to my target?
Cmd-Shift-G in any open dialog under OS X triggers “go to folder” (in which you can enter any path). Alternatively you can
open /opt/local/libin the Terminal (which opens the folder in a Finder window), then drag the library into your project.