Qt 4.8.5 build failure with libc++ on OS X Mavericks (JavaScriptCore)

As of OS X Mavericks, the default standard c++ library switched from libstdc++ to libc+. With some trivial modifications to Qt build configuration (simply swapping out the min mac os version to something >= 10.7, adding -stdlib=libc+ flag), 4.8 can be coaxed to compile and link against libc++ on Mavericks.

While most of the Qt library is able to build cleanly, the WTF module of the third party JavaScriptCore code is failing to build. The build and configure logs as well as the patched configuration files can be found here: https://gist.github.com/jensenb/7352148

All of the errors point to a problematic definition of the nullptr type, but I have no idea what is wrong with the definition.