Qt 4.8.0 Mac OS X binary library seems to require OS X 10.7 (Lion)

The Qt 4.8.0 Mac OS X library dmg downloadable at http://get.qt.nokia.com/qt/source/qt-mac-opensource-4.8.0.dmg seems to require Mac OS X 10.7 (Lion). My system is Mac OS X 10.6 (Snow Leopard). After installing that package and rebuilding my project's code I've got the following error from the dynamic linker at runtime:

Process: Swift [76920]
Path: /Users/tobias/dev/rep/swift-trunk/Swift/QtUI/Swift.app/Contents/MacOS/Swift
Identifier: im.swift.Swift
Version: ??? (2.0alpha-dev480)
Code Type: X86-64 (Native)
Parent Process: launchd [193]

Date/Time: 2011-12-15 19:17:20.754 +0100
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Symbol not found: _kCFWebServicesProviderDefaultDisplayNameKey
Referenced from: /Library/Frameworks/QtWebKit.framework/Versions/4/QtWebKit
Expected in: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation

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