Cmake cannot find package for dji onboard sdk file

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Hi

I was using dji onboard SDK for develop and meet problems about include sdk file into my project.

I put several project in one workspace,

After i 'catkin_make' it, it shows error,

CMake Warning at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76 (find_package):
  Could not find a package configuration file provided by "dji_sdk" with any
  of the following names:

    dji_sdkConfig.cmake
    dji_sdk-config.cmake

  Add the installation prefix of "dji_sdk" to CMAKE_PREFIX_PATH or set
  "dji_sdk_DIR" to a directory containing one of the above files.  If
  "dji_sdk" provides a separate development package or SDK, be sure it has
  been installed.
Call Stack (most recent call first):
  meteorOnboard/fcu/CMakeLists.txt:8 (find_package)


-- Could not find the required component 'dji_sdk'. The following CMake error indicates that you either need to install the package with the same name or change your environment so that it can be found.
CMake Error at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "dji_sdk" with any
  of the following names:

    dji_sdkConfig.cmake
    dji_sdk-config.cmake

  Add the installation prefix of "dji_sdk" to CMAKE_PREFIX_PATH or set
  "dji_sdk_DIR" to a directory containing one of the above files.  If
  "dji_sdk" provides a separate development package or SDK, be sure it has
  been installed.
Call Stack (most recent call first):
  meteorOnboard/fcu/CMakeLists.txt:8 (find_package)

Any advice appreciated.

Glen