Created attachment 464238 [details] Build log I have both Qt4 and Qt5 around, in detail: # ls -1 /var/db/pkg/dev-qt designer-4.8.7 designer-5.7.1 linguist-tools-5.7.1 qt3support-4.8.7 qtchooser-0_p20151008 qtconcurrent-5.7.1 qtcore-4.8.7-r2 qtcore-5.7.1-r1 qtdbus-4.8.7 qtdbus-5.7.1 qtdeclarative-4.8.7 qtdeclarative-5.7.1 qtgui-4.8.7 qtgui-5.7.1 qthelp-4.8.7 qtimageformats-5.7.1 qtlockedfile-2.4.1_p20150629 qtmultimedia-4.8.7 qtnetwork-5.7.1 qtopengl-4.8.7 qtopengl-5.7.1 qtprintsupport-5.7.1 qtquickcontrols-5.7.1 qtscript-4.8.7 qtscript-5.7.1 qtsingleapplication-2.6.1_p20150629 qtsql-4.8.7-r1 qtsql-5.7.1 qtsvg-4.8.7 qtsvg-5.7.1 qttest-4.8.7 qttest-5.7.1 qttranslations-4.8.7 qtwebkit-4.8.7 qtwebkit-5.7.1 qtwidgets-5.7.1 qtx11extras-5.7.1 qtxml-5.7.1 qtxmlpatterns-4.8.7 qtxmlpatterns-5.7.1 Please see the build log attached.
From config.log: configure:4891: checking for Qt library version >= 5.1 configure:4912: x86_64-pc-linux-gnu-g++ -c -march=native -O2 -pipe -frecord-gcc-switches -I/usr/include/qt5 -fPIC conftest.cpp >&5 In file included from /usr/include/qt5/QtCore/qglobal.h:83:0, from conftest.cpp:16: /usr/include/qt5/QtCore/qcompilerdetection.h:562:6: error: #error Qt requires a C++11 compiler and yours does not seem to be that. # error Qt requires a C++11 compiler and yours does not seem to be that. so we need to force building this package with -std=c++11
commit e04f68d3018d829a464ffd31f8e0a0bd351a9149 Author: Alexis Ballier <aballier@gentoo.org> Date: Mon Feb 20 10:04:37 2017 +0100 media-sound/qtractor: Append -std=c++11 CXXFLAGS, bug #609742.
