iPhone SDK 4 available only for Mac OS X Snow Leopard?

I am about to download SDK 4 for iPhone development but on their website the download is for Mac OS X Snow Leopard. The current开发者_运维问答 version on my Mac is Mac OS X Leopard 10.5.8... Won't I be able to install the SDK without upgrading to Mac OS X Snow Leopard?

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Specifically, Xcode 3.2.3 with iPhone SDK (iOS4) is a Snow Leopard install only, as far as I see.

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I think that iOS4 is bringing a lot more feature parity between itself and snow leopard. So I don't think apple will be releasing this download for leopard any time soon. Though check the developer forums to make sure.

Sadly though you may need to upgrade if you want to continue to develop for iOS4.