opencv_sources = [
  'gstopencvutils.cpp',
  'gstopencvvideofilter.cpp',
]

opencv_headers = [
  'opencv-prelude.h',
  'gstopencvutils.h',
  'gstopencvvideofilter.h',
]

opencv_dep = dependency('opencv', version : '>= 3.0.0', required : false)
if not opencv_dep.found()
  opencv_dep = dependency('opencv4', version : '>= 4.0.0', required : false)
endif
if opencv_dep.found()
  # opencv4 seems to ship with .pc file that references non-existent include dir
  # (/usr/include/opencv4/opencv instead of /usr/include/opencv4/opencv2)
  # clang 10 complains about the following header in opencv4
  # /usr/include/opencv4/opencv2/flann/logger.h:83:36: error: format string is not a string literal [-Werror,-Wformat-nonliteral]
  gstopencv_cargs = cxx.get_supported_arguments(['-Wno-missing-include-dirs', '-Wno-format-nonliteral'])

  gstopencv = library('gstopencv-' + api_version,
    opencv_sources,
    c_args : gst_plugins_bad_args + ['-DBUILDING_GST_OPENCV'],
    cpp_args : gst_plugins_bad_args + gstopencv_cargs + ['-DBUILDING_GST_OPENCV'],
    include_directories : [configinc, libsinc],
    version : libversion,
    soversion : soversion,
  darwin_versions : osxversion,
    install : true,
    dependencies : [gstbase_dep, gstvideo_dep, opencv_dep],
  )

  gstopencv_dep = declare_dependency(link_with: gstopencv,
    include_directories : [libsinc],
    dependencies : [gstvideo_dep, opencv_dep])

  install_headers(opencv_headers, subdir : 'gstreamer-1.0/gst/opencv')
elif get_option('opencv').enabled()
  error('OpenCV support enabled but required dependencies were not found.')
else
  gstopencv_dep = disabler()
endif