Fails to build with Qt 5.6

(yakkety)chr1s@farnsworth:~/src/oxide/crmaster/src/objdir-yakkety$ cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_TESTS=1 ../
-- The C compiler identification is GNU 6.1.1
-- The CXX compiler identification is GNU 6.1.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test _COMPILER_HAS_CXX11_RESULT
-- Performing Test _COMPILER_HAS_CXX11_RESULT - Success
-- Found Gettext: /usr/bin/msgmerge (found version "0.19.8.1")
-- Installing: /home/chr1s/src/oxide/crmaster/src/objdir-yakkety/out/bin/run_qmlapp.sh
-- Performing Test QTGUI_OPENGL_REQUIRES_GL_LINKING
-- Performing Test QTGUI_OPENGL_REQUIRES_GL_LINKING - Failed
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Checking for module 'Qt5PlatformSupport'
-- No package 'Qt5PlatformSupport' found
CMake Error at /usr/share/cmake-3.5/Modules/FindPkgConfig.cmake:367 (message):
  A required package was not found
Call Stack (most recent call first):
  /usr/share/cmake-3.5/Modules/FindPkgConfig.cmake:532 (_pkg_check_modules_internal)
  oxide/qt/tests/mock/qpa/CMakeLists.txt:23 (pkg_check_modules)

-- Configuring incomplete, errors occurred!
See also "/home/chr1s/src/oxide/crmaster/src/objdir-yakkety/CMakeFiles/CMakeOutput.log".
See also "/home/chr1s/src/oxide/crmaster/src/objdir-yakkety/CMakeFiles/CMakeError.log".

It seems that Qt5PlatformSupport.pc no longer exists