Compile by cmake, missing gazeboConfig.cmake or gazebo-config.cmake

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Hi,

I use Gazebo 9, ROS melodic, ubuntu 18.08.

When I compile packages using catkin_make, I get cmake error:

Could not find a package configuration file provided by "gazebo" with any of the following names:

gazeboConfig.cmake gazebo-config.cmake Add the installation prefix of "gazebo" to CMAKE_PREFIX_PATH or set "gazebo_DIR" to a directory containing one of the above files. If "gazebo" provides a separate development package or SDK, be sure it has been installed.

I have installed libgazebo9-dev, but I still dont have these .cmake files. Could you help me?