The plasma-keyboard is a virtual keyboard based on Qt Virtual Keyboard designed to integrate in Plasma.
mkdir build && cd build
cmake ..
make && make installIf the Virtual Keyboard does not show up add KWIN_IM_SHOW_ALWAYS=1 to kwin's environment variables.
To use Qt's builtin keyboard layouts rather than the ones we supply in plasma-keyboard, set PLASMA_KEYBOARD_USE_QT_LAYOUTS=1 to kwin's environment variables.