An example plug-in for Calabash.
$ make dylib
# If you see output like this:
#
# iPhone Developer: ambiguous (matches "iPhone Developer: Person A (2<snip>Q)"
# and "iPhone Developer: Person B (8<snip>F)"
# in /Users/<snip>/Library/Keychains/login.keychain)
#
# run 'make' with a CODE_SIGN_IDENTITY.
$ CODE_SIGN_IDENTITY="iPhone Developer: Your Name (8Q<snip>9F)" make dylib
Copy and add the resulting memoryPluginCalabash.dylib
to your Xcode project.