http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56926
--- Comment #7 from baltic <1000hz.radiowave at gmail dot com> --- (In reply to baltic from comment #5) > worked fine with 4.6 This is not true anymore :) was probably working fine with previous versions of the Qt, because headers were smaller back than. Now 4.6 version of MinGW-64 doesn't work with the PCH's full of Qt headers either.