Snow Leopard Crash

I am experiencing a crash on Snow Leopard. The crash is reproducible with a few of the example apps. I am building Qt on Mountain Lion.

Note: I have only observed the crash when running on a CPU that is not 64-bit capable. It runs fine on Intel Core 2 Duo and newer. Though, this may be coincidental.

Trace:
0 ??? 0000000000 0 + 0
1 QtGui 0x0003e274 qt_mac_update_os_settings() + 2676
2 QtGui 0x0003f1b0 qt_init(QApplicationPrivate*, int) + 1904
3 QtGui 0x000b2f04 QApplicationPrivate::construct() + 290
4 QtGui 0x000b3db2 QApplication::QApplication(int&, char**, int) + 100
5 com.yourcompany.dragdroprobot 0x000064f8 main + 88
6 com.yourcompany.dragdroprobot 0x00003858 _start + 207
7 com.yourcompany.dragdroprobot 0x00003788 start + 40

The crash occurs on the call to qfontForThemeFont in src/gui/kernel/qapplication_mac.mm on line 504. It crashes before entering that funciton.