Meine App läuft einwandfrei, aber gdb kann sie mit dem folgenden Fehler nicht debuggen

(gdb) run
Starting program: /path/to/app 
Unable to find Mach task port for process-id 83767: (os/kern) failure (0x5).

Ich bin auf OS X Lion. GDB-Version ist

$ gdb --version
GNU gdb 6.3.50-20050815 (Apple version gdb-1752) (Sat Jan 28 03:02:46 UTC 2012)
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This GDB was configured as "x86_64-apple-darwin".