Symbolicatecrash does not work because mdfind cannot find anything

Running Xcode 4.5.2 on OSX Mountain Lion (10.8.2)

I try to symbolize crash reports, but the symbolicatecrash script always fails. I'm really not interested in app symbols. I need system library symbols, but they cannot even find them:

..fetching symbol file for UIKit--[undef] 
Searching []...-- NO MATCH
Searching in Spotlight for dsym with UUID of cd513a2f22f53d698c3e10f6fe48a63e
Running mdfind "com_apple_xcode_dsym_uuids == CD513A2F-22F5-3D69-8C3E-10F6FE48A63E"
@dsym_paths = (  )
@exec_names = (  )
Did not find executable for dsym
## Warning: Can't find any unstripped binary that matches version of /System/Library/Frameworks/UIKit.framework/UIKit 

UIKit.framework with this UUID exists:

$ pwd
/Users/karl/Library/Developer/Xcode/iOS DeviceSupport/5.1.1 (9B206)/Symbols/System/Library/Frameworks
$ dwarfdump --uuid UIKit.framework/UIKit 
UUID: CD513A2F-22F5-3D69-8C3E-10F6FE48A63E (armv7) UIKit.framework/UIKit

However, mdfind refuses to see it:

$ mdfind "com_apple_xcode_dsym_uuids == CD513A2F-22F5-3D69-8C3E-10F6FE48A63E"
$ 

Even a search using mdfind "com_apple_xcode_dsym_uuids == *" does not give any results inside the library directory or any system library / framework; only dSYM files from the applications that I compiled are displayed.

How to fix mdfind so that it includes system libraries in its search engines?