Unknown CMake command "ign_find_package".

edit

I am trying to compile a plugin for ign-gazebo.

Procedure I followed: 1. I copied my plugin folder "mimic_joint_plugin" to ign-gazebo/examples/plugin. 2. made a build dir 3. compiled the directory using cmake .. command and got this error on the console.

Version: Ignition citadel

adwaitnaik@ubuntu:~/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin$ mkdir build
adwaitnaik@ubuntu:~/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin$ cd build
adwaitnaik@ubuntu:~/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin/build$ cmake ..
-- The C compiler identification is GNU 8.4.0
-- The CXX compiler identification is GNU 8.4.0
-- 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
-- Using CATKIN_DEVEL_PREFIX: /home/adwaitnaik/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin/build/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.17", minimum required is "2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/adwaitnaik/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin/build/test_results
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.17") 
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.29
-- BUILD_SHARED_LIBS is on
CMake Error at CMakeLists.txt:208 (ign_find_package):
  Unknown CMake command "ign_find_package".


-- Configuring incomplete, errors occurred!
See also "/home/adwaitnaik/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin/build/CMakeFiles/CMakeOutput.log".
See also "/home/adwaitnaik/ign_ws/src/ign-gazebo/examples/plugin/mimic_joint_plugin/build/CMakeFiles/CMakeError.log".

Note: ign_ws is the workspace in which I have installed all the ignition libraries from the source and compiled them.

Please can anybody suggest a solution on how to comile plugins for ign-gazebo?