I am using XCode 4.3.3 and want to include custom frameworks (in my case OCMock) into my Mac OS X project. I have put OCMock.framework (version 2.0) into /Library/Frameworks for now and when I open the build phases tab for my unit testing target that I want to link against OCMock I have the option to add the framework here:

When I click the + button I get presented with a search dialog that I can use to search for frameworks. /Library/Frameworks is not being searched for here.

It just searches the frameworks directory inside XCode.app and the Mac OS X 10.7 SDK which I am building the project with.
So how can I extend the search dialog with more locations, for example, /Library/Frameworks so that I can easily search for and include OCMock.framework?
Don’t place the framework in system directories. Instead, drag it into the Project Navigator in Xcode, and tell Xcode to copy the files into the project folder. Once a framework has been added to the project’s files, you can drag it from the navigator into the Link Binary With Libraries build phase.