to produce a bundle, you should run:
$ xcodebuild -alltargets -arch x86_64 -sdk macosx10.6

Then, expecting you have compiled Ultragrid:
$ cd ../../         # to UG main directory
$ make bundle
$ cd -              # go back here

 you should copy its binary to bundle:
$ cp ../../uv.app/Contents/MacOS/uv build/Release/UltraGrid\ GUI.app/Contents/MacOS/

and libraries:
$ mkdir build/Release/UltraGrid\ GUI.app/Contents/libs
$ cp ../../uv.app/Contents/libs/* build/Release/UltraGrid\ GUI.app/Contents/libs

