Compiling opencv samples: unknown cmake command ocv_check_dependencies

Question

I am trying to build the OpenCV samples which come with the source package and I get the following:

CMake Error at CMakeLists.txt:10 (ocv_check_dependencies)         


        

Answer 1

Reason

error message context:

CMake Error at CMakeLists.txt:10 (ocv_check_dependencies):
  Unknown CMake command "ocv_check_dependencies".

This error message happens because cmake can't find the definition of ocv_check_dependencies

That's why the console said Unknown CMake command

Solution

If cmake cannot find where ocv_check_dependencies is defined

Just like @Nick Hockings Said:

ocv_check_dependencies is a macro defined in Your/OpenCV/path/OpenCVModule.cmake

macro(ocv_check_dependencies)
  set(OCV_DEPENDENCIES_FOUND TRUE)
  foreach(d ${ARGN})
    if(d MATCHES "^opencv_[^ ]+$" AND NOT HAVE_${d})
      set(OCV_DEPENDENCIES_FOUND FALSE)
      break()
    endif()
  endforeach()
endmacro()

The fastest way is to copy this snippet above to your CMakeList.txt file right above where ocv_check_dependencies is

Therefore, cmake can finally understand what it is

That should do the trick, i hope no one else will bother with this question in the future