Me temo que firemonkey que viene con XE2 no es compatible con lo que tienes...
iOS Requirements on Mac
- OS X 10.6 Snow Leopard or 10.7 Lion (Neither OS is supported on legacy PowerPC- and 680x0-based Macintosh systems. All Macs since 2007 are Intel-based; all since 2008 are 64-bit, which Lion requires.)
- Xcode and the iOS SDK installed.
- Requires membership in one of several Apple Developer Programs, which are described later in this topic.
- Xcode version 3.2.5 to 4.2 verified working.
- iOS SDK version 4.2.x, 4.3.x, or 5.0 verified working.
- iOS device connected to Mac by USB port
Más info en:
http://docwiki.embarcadero.com/RADSt..._Setup_for_iOS
Sin embargo parece que XE3 con Firemonkey II si te puede servir, pues sólo indican:
Mac OS X Requirements
Your Mac has a qualified GPU if your Mac is running any of the following OS:
OS X 10.6 Snow Leopard
OS X 10.7 Lion
OS X 10.8 Mountain Lion