CMake warnings: "Could not find a package configuration file..."

CMake Warning at cmake/Macros/FindQt5Extra.cmake:7 (find_package):
  By not providing "FindQt5Multimedia.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "Qt5Multimedia", but CMake did not find one.
  Could not find a package configuration file provided by "Qt5Multimedia"
  with any of the following names:
    Qt5MultimediaConfig.cmake
    qt5multimedia-config.cmake
  Add the installation prefix of "Qt5Multimedia" to CMAKE_PREFIX_PATH or set
  "Qt5Multimedia_DIR" to a directory containing one of the above files.  If
  "Qt5Multimedia" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  CMakeLists.txt:72 (include)