DYLD_IMAGE_SUFFIX=_debug makes application crash on Mac OS X - Snow Leopard

When setting DYLD_IMAGE_SUFFIX=_debug to be able to debug an application on Mac OS X - 10.6 then it crashes when the libs
libSystem.B_debug.dylib and libmx.A_debug.dylib in in usr/lib are loaded.

Renaming these libs seems to solve the problem.

zeppelin-2:application bene$ DYLD_IMAGE_SUFFIX=_debug ./application.
application.app/ application.pro application.pro.user application.qrc
zeppelin-2:application bene$ DYLD_IMAGE_SUFFIX=_debug ./application.app/Contents/
Frameworks/ Info.plist MacOS/ PkgInfo PlugIns/ Resources/
zeppelin-2:application bene$ DYLD_IMAGE_SUFFIX=_debug ./application.app/Contents/MacOS/application
Abort trap
zeppelin-2:application bene$ ./
.moc/ .obj/ .pch/ .rcc/ Contents/ application.app/ images/ qtc-gdbmacros/
zeppelin-2:application bene$ ./application.app/Contents/MacOS/application
zeppelin-2:application bene$ DYLD_IMAGE_SUFFIX=_debug ./application.app/Contents/MacOS/application