CMake error when trying to add opencv libraries

Question

I am trying to work with a depth sensor and trying to get the grayscale image and display it with OpenCV. I can access the data from the depth sensor without any issues. But I g

Answer 1

project() call should precede most of other commands call.

Normally, only cmake_minimum_required() and variables assignments may come before the project().

Correct:

cmake_minimum_required(VERSION 2.8)

set(CMAKE_PREFIX_PATH "share")

project (depthDataCallBack)

find_package(royale REQUIRED)
find_package(OpenCV REQUIRED)
link_directories(${royale_LIB_DIR})

...