Rebuilding the debugging helper segfaults on linux

I updated to the current head 1fb92cf87e60b506ffbfd9848b847da3f79b36e6 on the master branch under linux (Fedora 8), and loaded my project and got ready to debug it. I realized that I hadn't built the debugging helper recently (I have gdb 7 if that matters) . I loaded the settings panel and clicked "rebuild" for debugging helper. It aborted. I reproduced it running under gdb. Here's where it died:

Program received signal SIGSEGV, Segmentation fault.

0x08f0b0c8 in ?? ()

(gdb) up

#1 0x029e42b1 in Qt4ProjectManager::QtVersion::possibleToolChainTypes() const ()

from /home/gcoulbourne/TEST/creator/lib/qtcreator/plugins/Nokia/libQt4ProjectManager.so

(gdb)

#2 0x02997185 in Qt4ProjectManager::Qt4Project::toolChainType(ProjectExplorer::BuildConfiguration*) const ()

from /home/gcoulbourne/TEST/creator/lib/qtcreator/plugins/Nokia/libQt4ProjectManager.so