Build failed because of opencv not found

[guglielmobartelloni]

Here there is the output:
Errors << hr_msgs:cmake /home/studentgul/nonva/HEAD/logs/hr_msgs/build.cmake.010.log
CMake Warning at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76 (find_package):
Could not find a package configuration file provided by "opencv" with any
of the following names:

opencvConfig.cmake
opencv-config.cmake

Add the installation prefix of "opencv" to CMAKE_PREFIX_PATH or set
"opencv_DIR" to a directory containing one of the above files. If "opencv"
provides a separate development package or SDK, be sure it has been
installed.
Call Stack (most recent call first):
CMakeLists.txt:7 (find_package)

CMake Error at /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
Could not find a package configuration file provided by "opencv" with any
of the following names:

opencvConfig.cmake
opencv-config.cmake

Add the installation prefix of "opencv" to CMAKE_PREFIX_PATH or set
"opencv_DIR" to a directory containing one of the above files. If "opencv"
provides a separate development package or SDK, be sure it has been
installed.
Call Stack (most recent call first):
CMakeLists.txt:7 (find_package)

cd /home/studentgul/nonva/HEAD/build/hr_msgs; catkin build --get-env hr_msgs | catkin env -si /usr/bin/cmake /home/studentgul/nonva/HEAD/src/hr_msgs --no-warn-unused-cli -DCATKIN_DEVEL_PREFIX=/home/studentgul/nonva/HEAD/devel/.private/hr_msgs -DCMAKE_INSTALL_PREFIX=/home/studentgul/nonva/HEAD/install; cd -
............................................................................................................................................................................................................................................
Failed << hr_msgs:cmake [ Exited with code 1 ]
Failed <<< hr_msgs [ 1.5 seconds ]
Abandoned <<< perception [ Unrelated job failed ]
Abandoned <<< performances [ Unrelated job failed ]
Abandoned <<< ros2opencv [ Unrelated job failed ]
Abandoned <<< ros_face_recognition [ Unrelated job failed ]
Abandoned <<< ros_mongo [ Unrelated job failed ]
Abandoned <<< ros_pololu [ Unrelated job failed ]
Abandoned <<< ros_tts [ Unrelated job failed ]
Abandoned <<< webui [ Unrelated job failed ]
Abandoned <<< basic_head_api [ Unrelated job failed ]
Abandoned <<< pau2motors [ Unrelated job failed ]
Abandoned <<< pi_vision [ Unrelated job failed ]
Abandoned <<< pi_face_tracker [ Unrelated job failed ]
Abandoned <<< pi_face_tracker_gui [ Unrelated job failed ]
Finished <<< motors_safety [ 3.4 seconds ]
Finished <<< hr_reflexes [ 3.9 seconds ]
Finished <<< chatbot [ 4.6 seconds ]
Finished <<< blender_api_msgs [ 5.3 seconds ]
Finished <<< audio_stream [ 5.6 seconds ]
[build] Summary: 5 of 19 packages succeeded.
[build] Ignored: None.
[build] Warnings: None.
[build] Abandoned: 13 packages were abandoned.
[build] Failed: 1 packages failed.
[build] Runtime: 6.2 seconds total.