app-office/qbankmanager-0.51_beta dies near the end of the emerge with the error mainwindow.cpp: In member function 'void MainWindow::slotSettings()': mainwindow.cpp:621: error: 'QWidget' is an inaccessible base of 'QBCfgTabSettings' Perhaps this happens only due to stricter rules in gcc-4.4 (I did not try other gcc versions). Tracking back, it seems that QBCfgTabUi should be inherited public instead of private for QBCfgTab in the header file /usr/include/qbanking/qbcfgtab.h Therefore, the actual cause of the bug seems to be in net-libs/aqbanking-4.0.0. I attach a patch for the latter.
Created attachment 195519 [details, diff] Patch against net-libs/aqbanking-4.0.0 to make app-office/qbankmanager-0.9.51_beta compile with gcc-4.4
Thanks for posting the solution, assigning to aqbanking maintainer.
Thanks for the patch, committed and sent upstream.