kdesignerplugin depends on kdewebkit, which is depends on qtwebkit. But the Qtwebkit is removed in Qt 5.6: http://blog.qt.io/blog/2016/03/16/qt-5-6-released/ kdesignerplugin is REQUIRED for many plasma components via kdelibs4support. Please remove the kdewebkit/qtwebkit dependency, or set this package to OPTIONAL for kdelibs4support. Reproducible: Always
Are you compiling from source? The KF5WebKit dependency is already optional in KF5DesignerPlugin, see CMakeLists.txt: ... find_package(KF5WebKit ${KF5_DEP_VERSION}) set_package_properties(KF5WebKit PROPERTIES TYPE OPTIONAL PURPOSE "Required to build the Qt Designer plugin for the KDEWebKit widgets") ... if(Qt5Designer_FOUND AND KF5WebKit_FOUND) set(BUILD_KDEWEBKIT_DESIGNER_PLUGIN TRUE) endif() ...
Yes, I compiled from source. And the kdewebkit is really optional dependency, sorry for this issue.