Ignore any files that stems from building in the development tree itself,
which can be useful e.g. for letting the debugger easily pick up the
source files.
Each version of Qt supports a set of OpenGL levels; the level displayed
to the user is only as high as what was supported at compile-time. Hence
it should be harmless to degrade gracefully to previous Qt versions.
Versions of Qt < 4.7 do not have a QString constructor from QChar*
without specifying the size of the string. However, since the QString
is copy-on-write, the QString object can be passed to the copy
constructor of the return value directly!
