Initially, I had a problem with okular -- there was (suddenly) no plugin to display pdf files. And after some digging I've released that the actual problem is with poppler library. Okular configuration stage log: ----------------------------------------------------------------------------- -- The following OPTIONAL packages could NOT be located on your system. -- Consider installing them to enable more features from this software. ----------------------------------------------------------------------------- * Poppler-Qt4 (0.12.1 or higher) <http://poppler.freedesktop.org> A PDF rendering library Support for PDF files in okular. poppler-qt4 is missing despite its support is requested with "pdf" use-flag on okular package, there definetelly should be an *explicit* error, silent errors don't make debugging easier. Next, poppler on the configuration stage fails to detect qt4 (while it is present and poppler has qt4 use-flag enabled). It could be clearly seen in its configuration logs: Building Poppler with support for: font configuration: fontconfig splash output: yes cairo output: yes qt4 wrapper: no <-- look here qt5 wrapper: no The problem arises when qt5 is also installed in the system. Without any additional setup qmake will fallback to qt5-related binary: $ qmake -v QMake version 3.0 Using Qt version 5.5.1 in /usr/lib64 Poppler on its cmake configuration stage looks for qt4-version of the qmake (and obviously fails). To check extactly the scenario I've done the following (mark qt4 to be *required* import -- why is it not (with qt4 use flag enabled)?): # ebuild /usr/portage/app-text/poppler/poppler-0.39.0.ebuild clean prepare <...> # sed -i 's|macro_optional_find_package(Qt4)|find_package(Qt4 REQUIRED)|' /var/tmp/portage/app-text/poppler-0.39.0/work/poppler-0.39.0/CMakeLists.txt # ebuild /usr/portage/app-text/poppler/poppler-0.39.0.ebuild configure <...> CMake Error at cmake/modules/FindQt4.cmake:1301 (MESSAGE): Qt qmake not found! Call Stack (most recent call first): CMakeLists.txt:111 (find_package) So, the quick fix of the issue (is to enable qt4 via environment variables): # echo 'QT_SELECT=4' >> /etc/portage/env/qt4.conf # echo 'app-text/poppler qt4.conf' >> /etc/portage/package.env With this workaround in use poppler and okular configuration are fixed (and pdf files are readable again by okular): Building Poppler with support for: font configuration: fontconfig splash output: yes cairo output: yes qt4 wrapper: yes <-- look here qt5 wrapper: no Okular: -- Checking for module 'poppler-qt4' -- Found poppler-qt4, version 0.39.0 Anyway, the workaround will probably break qt5 support, so a proper fix is required.
Installed qt packages list: $ equery list '*qt*' * Searching for *qt* ... [IP-] [ ] app-eselect/eselect-qtgraphicssystem-1.1.1:0 [IP-] [ ] dev-libs/libdbusmenu-qt-0.9.3_pre20140619-r1:0 [IP-] [ ] dev-qt/qt3support-4.8.7:4 [IP-] [ ] dev-qt/qtchooser-0_p20151008:0 [IP-] [ ] dev-qt/qtcore-4.8.7-r1:4 [IP-] [ ] dev-qt/qtcore-5.5.1:5 [IP-] [ ] dev-qt/qtdbus-4.8.7:4 [IP-] [ ] dev-qt/qtdbus-5.5.1:5 [IP-] [ ] dev-qt/qtdeclarative-4.8.7:4 [IP-] [ ] dev-qt/qtdeclarative-5.5.1-r1:5 [IP-] [ ] dev-qt/qtgui-4.8.7:4 [IP-] [ ] dev-qt/qtgui-5.5.1:5 [IP-] [ ] dev-qt/qtmultimedia-5.5.1-r1:5 [IP-] [ ] dev-qt/qtnetwork-5.5.1:5 [IP-] [ ] dev-qt/qtopengl-4.8.7:4 [IP-] [ ] dev-qt/qtprintsupport-5.5.1:5 [IP-] [ ] dev-qt/qtscript-4.8.7:4 [IP-] [ ] dev-qt/qtsql-4.8.7-r1:4 [IP-] [ ] dev-qt/qtsvg-4.8.7:4 [IP-] [ ] dev-qt/qtsvg-5.5.1-r1:5 [IP-] [ ] dev-qt/qttest-4.8.7:4 [IP-] [ ] dev-qt/qttest-5.5.1:5 [IP-] [ ] dev-qt/qttranslations-4.8.7:4 [IP-] [ ] dev-qt/qtwebkit-4.8.7:4 [IP-] [ ] dev-qt/qtwidgets-5.5.1-r1:5 [IP-] [ ] dev-qt/qtx11extras-5.5.1:5 [IP-] [ ] dev-qt/qtxml-5.5.1:5 [IP-] [ ] dev-qt/qtxmlpatterns-4.8.7:4 [IP-] [ ] x11-themes/qtcurve-1.8.18-r1:0
This appears to affect all versions. The cause seems to be a bundled FindQt4.cmake - system versions are patched to account for the slotted qmake.
Created attachment 423406 [details, diff] poppler-FindQt4.patch Proposed patch.
> Proposed patch. Can confirm that the patch fixed the issue for me.
Thanks, fixed in git. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c05a126fc8e2f1c17b1657c3483a337bcce63094
