http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678
--- Comment #36 from David Kredba <nheghathivhistha at gmail dot com> --- I did not: /var/tmp/portage/app-office/calligra-2.8.0/temp/ccv1d4Ui.ltrans1.ltrans.o: In function `operator<': /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' /var/tmp/portage/app-office/calligra-2.8.0/temp/ccv1d4Ui.ltrans1.ltrans.o: In function `qMapLessThanKey': /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' /var/tmp/portage/app-office/calligra-2.8.0/temp/ccv1d4Ui.ltrans1.ltrans.o: In function `operator<': /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: undefined reference to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' /var/tmp/portage/app-office/calligra-2.8.0/temp/ccv1d4Ui.ltrans1.ltrans.o:/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/sheets/Condition.h:170: more undefined references to `Calligra::Sheets::qHash(Calligra::Sheets::Conditions const&)' follow collect2: error: ld returned 1 exit status sheets/CMakeFiles/calligrasheetscommon.dir/build.make:3104: recipe for target 'lib/libcalligrasheetscommon.so.13.0.0' failed trunk revision 208592 I am sorry I do not know how to reduce it.