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    Bug 
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    Resolution: Out of scope
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     Not Evaluated Not Evaluated
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    None
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    4.8.1, 4.8.5
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    None
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    Arch Linux x86_64
 GCC 4.7-20120407
As summary says, if you build qt from sources using GCC 4.7 this will produce a bugged assistant binary which segfault on start:
$ assistant
Object::connect: No such signal HelpViewer::printRequested()
Segmentation fault (core dumped)
If you need others info, please ask.
Thanks