Trying to emerge dev-util/qt-creator-1.3.1 results in the following: x86_64-pc-linux-gnu-g++ -c -pipe -pipe -g -mtune=core2 -march=core2 -O2 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -D_REENTRANT -fPIC -DIDE_LIBRARY_BASENAME=\"lib64\" -DQT_NO_CAST_TO_ASCII -DQT_CLUCENE_SUPPORT -DHELP_LIBRARY -DQT_NO_DEBUG -DQT_PLUGIN -DQT_WEBKIT_LIB -DQT_SQL_LIB -DQT_XML_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtWebKit -I/usr/include/qt4 -I/usr/include/qt4/QtHelp -I../../libs -I/var/tmp/portage/dev-util/qt-creator-1.3.1/work/qt-creator-1.3.1-src/tools -I../../plugins -I../../shared/help -I../../shared -I.moc/release-shared -I.uic -o .obj/release-shared/docsettingspage.o docsettingspage.cpp docsettingspage.cpp:34:30: error: QtHelp/QHelpEngine: No such file or directory x86_64-pc-linux-gnu-g++ -c -pipe -pipe -g -mtune=core2 -march=core2 -O2 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -D_REENTRANT -fPIC -DTEXTEDITOR_LIBRARY -DIDE_LIBRARY_BASENAME=\"lib64\" -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_PLUGIN -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I../../libs -I/var/tmp/portage/dev-util/qt-creator-1.3.1/work/qt-creator-1.3.1-src/tools -I../../plugins -I.moc/release-shared -I.uic -o .obj/release-shared/basetextdocument.o basetextdocument.cpp docsettingspage.cpp: In member function 'virtual QWidget* Help::Internal::DocSettingsPage::createPage(QWidget*)': docsettingspage.cpp:75: error: invalid use of incomplete type 'struct QHelpEngine' docsettingspage.h:39: error: forward declaration of 'struct QHelpEngine' docsettingspage.cpp: In member function 'void Help::Internal::DocSettingsPage::addDocumentation()': docsettingspage.cpp:92: error: 'QHelpEngineCore' has not been declared docsettingspage.cpp:100: error: invalid use of incomplete type 'struct QHelpEngine' docsettingspage.h:39: error: forward declaration of 'struct QHelpEngine' docsettingspage.cpp: In member function 'bool Help::Internal::DocSettingsPage::applyChanges()': docsettingspage.cpp:133: error: invalid use of incomplete type 'struct QHelpEngine' docsettingspage.h:39: error: forward declaration of 'struct QHelpEngine' make[3]: *** [.obj/release-shared/docsettingspage.o] Error 1 make[3]: Leaving directory `/var/tmp/portage/dev-util/qt-creator-1.3.1/work/qt-creator-1.3.1-src/src/plugins/help' make[2]: *** [sub-help-make_default] Error 2 make[2]: *** Waiting for unfinished jobs....
Created attachment 230059 [details] emerge --info =dev-util/qt-creator-1.3.1
Created attachment 230061 [details] build.log
The problem seems to originate with recent changes in qt-assistant-4.6.2-r1. See bug 317809. I downgraded to qt-assistant-4.6.2 and there are no more problems.
Closing. http://bugs.gentoo.org/show_bug.cgi?id=318079