Which Gentoo Package provides Qt5CompositorConfig.cmake?

I would like to compile and then install [Hawaii](http://hawaii-desktop.github.io/) from source code, but I am stuck at the compiling [GreenIsland](https://github.com/greenisland/greenisland) (a dependency of Hawaii) from source code stage. I created a build subdirectory of the source code directory with mkdir build and ran: cmake .. -DCMAKE_INSTALL_PREFIX=/usr but this gave the error: CMake Error at /usr/lib64/cmake/Qt5/Qt5Config.cmake:26 (find_package): Could not find a package configuration file provided by "Qt5Compositor" with any of the following names: Qt5CompositorConfig.cmake qt5compositor-config.cmake Add the installation prefix of "Qt5Compositor" to CMAKE_PREFIX_PATH or set "Qt5Compositor_DIR" to a directory containing one of the above files. If "Qt5Compositor" provides a separate development package or SDK, be sure it has been installed. Call Stack (most recent call first): CMakeLists.txt:60 (find_package) -- Configuring incomplete, errors occurred! See also "/home/fusion809/Programs/Hawaii/greenisland-0.6.0/build/CMakeFiles/CMakeOutput.log". [here](http://pastebin.com/suGdNKkE) is my log file (/home/fusion809/Programs/Hawaii/greenisland-0.6.0/build/CMakeFiles/CMakeOutput.log). I interpret this error to mean I am missing Qt5CompositorConfig.cmake from my system. What Portage ebuild do I need to merge to get this library? If relevant I am working on Sabayon Linux.