--- /dev/null
+menuconfig BR2_PACKAGE_OPENCV4
+ bool "opencv4"
+ depends on BR2_TOOLCHAIN_HAS_ATOMIC
+ depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
+ depends on BR2_INSTALL_LIBSTDCPP
+ depends on BR2_USE_WCHAR
+ depends on !BR2_STATIC_LIBS # include dlfcn.h
+ depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
+ depends on !BR2_PACKAGE_OPENCV3
+ select BR2_PACKAGE_ZLIB
+ help
+ OpenCV (Open Source Computer Vision) is a library of
+ programming functions for real time computer vision.
+
+ Note that the opencv_core module and the opencv_hal library
+ are always built and installed, not matter which other
+ modules are enabled below.
+
+ http://opencv.org/
+
+if BR2_PACKAGE_OPENCV4
+
+comment "OpenCV modules"
+
+config BR2_PACKAGE_OPENCV4_LIB_CALIB3D
+ bool "calib3d"
+ select BR2_PACKAGE_OPENCV4_LIB_FEATURES2D
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ help
+ Include opencv_calib3d (camera calibration and 3d
+ reconstruction) module into the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_FEATURES2D
+ bool "features2d"
+ select BR2_PACKAGE_OPENCV4_LIB_FLANN
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_ML
+ help
+ Include opencv_features2d (2d features framework) module
+ into the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_FLANN
+ bool "flann"
+ # opencv_core dependency is already enabled
+ help
+ Include opencv_flann (clustering and search in
+ multi-dimensional spaces) module into the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_HIGHGUI
+ bool "highgui"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGCODECS
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_VIDEOIO
+ help
+ Include opencv_highgui (high-level gui and media i/o) module
+ into the OpenCV build.
+
+if BR2_PACKAGE_OPENCV4_LIB_HIGHGUI
+
+choice
+ prompt "gui toolkit"
+ help
+ GUI toolkit to be used by the opencv_highgui module.
+
+config BR2_PACKAGE_OPENCV4_GUI_NONE
+ bool "none"
+
+config BR2_PACKAGE_OPENCV4_WITH_GTK
+ bool "gtk2"
+ depends on BR2_PACKAGE_LIBGTK2
+
+comment "gtk2 support needs libgtk2"
+ depends on BR2_USE_MMU # libgtk2 -> glib2
+ depends on BR2_TOOLCHAIN_HAS_SYNC_4
+ depends on !BR2_PACKAGE_LIBGTK2
+
+config BR2_PACKAGE_OPENCV4_WITH_GTK3
+ bool "gtk3"
+ depends on BR2_PACKAGE_LIBGTK3
+
+comment "gtk3 support needs libgtk3"
+ depends on BR2_USE_MMU # libgtk3 -> glib2
+ depends on BR2_TOOLCHAIN_HAS_SYNC_4
+ depends on !BR2_PACKAGE_LIBGTK3
+
+config BR2_PACKAGE_OPENCV4_WITH_QT5
+ bool "qt5"
+ depends on BR2_PACKAGE_QT5
+ select BR2_PACKAGE_QT5BASE_CONCURRENT
+ select BR2_PACKAGE_QT5BASE_GUI
+ select BR2_PACKAGE_QT5BASE_WIDGETS
+ help
+ Use Qt5 with base, concurrent, test, gui and widgets
+ components, as GUI toolkit.
+
+comment "qt5 support needs qt5"
+ depends on !BR2_PACKAGE_QT5
+
+endchoice
+
+config BR2_PACKAGE_OPENCV4_WITH_OPENGL
+ bool "opengl support"
+ # OpenGL support done using Qt5OpenGL, so depends on WITH_QT5
+ depends on BR2_PACKAGE_OPENCV4_WITH_QT5
+ # OpenGL support requires Qt5OpenGL with GL support, not GLES
+ depends on BR2_PACKAGE_QT5_GL_AVAILABLE
+ depends on BR2_PACKAGE_HAS_LIBGL
+ select BR2_PACKAGE_QT5BASE_OPENGL
+ help
+ Enable OpenGL for UI.
+
+comment "opengl support needs an OpenGL provider"
+ depends on BR2_PACKAGE_OPENCV4_WITH_QT5
+ depends on !BR2_PACKAGE_QT5_GL_AVAILABLE || \
+ !BR2_PACKAGE_HAS_LIBGL
+
+endif # BR2_PACKAGE_OPENCV4_LIB_HIGHGUI
+
+config BR2_PACKAGE_OPENCV4_LIB_IMGCODECS
+ bool "imgcodecs"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ help
+ Include opencv_imgcodecs (image codecs) module into the
+ OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ bool "imgproc"
+ # opencv_core dependency is already enabled
+ help
+ Include opencv_imgproc (image processing) module into the
+ OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_ML
+ bool "ml"
+ # opencv_core dependency is already enabled
+ help
+ Include opencv_ml (machine learning) module into the OpenCV
+ build.
+
+config BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
+ bool "objdetect"
+ # opencv_core dependency is already enabled
+ select BR2_PACKAGE_OPENCV4_LIB_CALIB3D
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_ML
+ help
+ Include opencv_objdetect (object detection) module into the
+ OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_PHOTO
+ bool "photo"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ help
+ Include opencv_photo (computational photography) module into
+ the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_PYTHON
+ bool "python"
+ depends on BR2_PACKAGE_PYTHON3
+ depends on BR2_PACKAGE_PYTHON_NUMPY_ARCH_SUPPORTS
+ depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL # python-numpy
+ select BR2_PACKAGE_PYTHON_NUMPY
+ help
+ Include opencv_python module into the OpenCV build. No
+ python example is installed.
+
+comment "python support needs glibc or musl"
+ depends on BR2_PACKAGE_PYTHON3
+ depends on BR2_PACKAGE_PYTHON_NUMPY_ARCH_SUPPORTS
+ depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)
+
+config BR2_PACKAGE_OPENCV4_LIB_SHAPE
+ bool "shape"
+ # opencv_core dependency is already enabled
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_VIDEO
+ help
+ Include opencv_shape (shape descriptors and matchers) module
+ into the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_STITCHING
+ bool "stitching"
+ select BR2_PACKAGE_OPENCV4_LIB_CALIB3D
+ select BR2_PACKAGE_OPENCV4_LIB_FEATURES2D
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_OBJDETECT
+ help
+ Include opencv_stitching (images stitching) module into the
+ OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_SUPERRES
+ bool "superres"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_VIDEO
+ help
+ Include opencv_superres (super resolution) module into the
+ OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_TS
+ bool "ts"
+ # opencv_core dependency is already enabled
+ select BR2_PACKAGE_OPENCV4_LIB_HIGHGUI
+ select BR2_PACKAGE_OPENCV4_LIB_IMGCODECS
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_VIDEOIO
+ help
+ Include opencv_ts (test) module into the OpenCV build.
+
+config BR2_PACKAGE_OPENCV4_LIB_VIDEOIO
+ bool "videoio"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGCODECS
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ help
+ Include opencv_videoio (media i/o) module into the OpenCV
+ build.
+
+config BR2_PACKAGE_OPENCV4_LIB_VIDEO
+ bool "video"
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ help
+ Include opencv_video (video analysis) module into the OpenCV
+ build.
+
+config BR2_PACKAGE_OPENCV4_LIB_VIDEOSTAB
+ bool "videostab"
+ select BR2_PACKAGE_OPENCV4_LIB_CALIB3D
+ select BR2_PACKAGE_OPENCV4_LIB_FEATURES2D
+ select BR2_PACKAGE_OPENCV4_LIB_IMGPROC
+ select BR2_PACKAGE_OPENCV4_LIB_PHOTO
+ select BR2_PACKAGE_OPENCV4_LIB_VIDEO
+ help
+ Include opencv_videostab (video stabilization) module into
+ the OpenCV build.
+
+comment "Test sets"
+config BR2_PACKAGE_OPENCV4_BUILD_TESTS
+ bool "build tests"
+
+config BR2_PACKAGE_OPENCV4_BUILD_PERF_TESTS
+ bool "build performance tests"
+
+comment "3rd party support"
+
+config BR2_PACKAGE_OPENCV4_WITH_FFMPEG
+ bool "ffmpeg support"
+ depends on BR2_PACKAGE_FFMPEG_ARCH_SUPPORTS
+ select BR2_PACKAGE_BZIP2
+ select BR2_PACKAGE_FFMPEG
+ select BR2_PACKAGE_FFMPEG_AVRESAMPLE
+ select BR2_PACKAGE_FFMPEG_SWSCALE
+ help
+ Use ffmpeg from the target system.
+
+config BR2_PACKAGE_OPENCV4_WITH_GSTREAMER1
+ bool "gstreamer-1.x"
+ depends on BR2_USE_MMU # gstreamer1 -> libglib2
+ select BR2_PACKAGE_GSTREAMER1
+ select BR2_PACKAGE_GST1_PLUGINS_BASE
+ select BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_APP
+ help
+ Enable gstreamer support.
+
+choice
+ prompt "jpeg2000 support"
+ help
+ Select the desired jpeg2000 library provider.
+
+config BR2_PACKAGE_OPENCV4_JPEG2000_NONE
+ bool "none"
+
+config BR2_PACKAGE_OPENCV4_JPEG2000_WITH_JASPER
+ bool "jasper"
+ select BR2_PACKAGE_JASPER
+ help
+ Enable jpeg2000 support through jasper.
+
+ Note: this does not use the libjasper bundled with opencv,
+ but uses the libjasper package installed system-wide by
+ Buildroot.
+
+config BR2_PACKAGE_OPENCV4_JPEG2000_WITH_OPENJPEG
+ bool "openjpeg"
+ select BR2_PACKAGE_OPENJPEG
+ help
+ Enable jpeg2000 support through openjpeg.
+
+ Note: this does not use the openjpeg bundled with opencv,
+ but uses the openjpeg package installed system-wide by
+ Buildroot.
+
+endchoice
+
+config BR2_PACKAGE_OPENCV4_WITH_JPEG
+ bool "jpeg support"
+ select BR2_PACKAGE_JPEG
+ help
+ Use shared libjpeg from the target system.
+
+config BR2_PACKAGE_OPENCV4_WITH_PNG
+ bool "png support"
+ select BR2_PACKAGE_LIBPNG
+ help
+ Use shared libpng from the target system.
+
+config BR2_PACKAGE_OPENCV4_WITH_PROTOBUF
+ bool "protobuf support"
+ depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
+ select BR2_PACKAGE_PROTOBUF
+ help
+ Use shared protobuf from the target system.
+
+config BR2_PACKAGE_OPENCV4_WITH_TIFF
+ bool "tiff support"
+ select BR2_PACKAGE_TIFF
+ help
+ Use shared libtiff from the target system.
+
+config BR2_PACKAGE_OPENCV4_WITH_V4L
+ bool "v4l support"
+ help
+ Enable Video 4 Linux support.
+
+ If the package libv4l is enabled, its support is
+ automatically enabled.
+
+config BR2_PACKAGE_OPENCV4_WITH_WEBP
+ bool "webp support"
+ select BR2_PACKAGE_WEBP
+ help
+ Enable WebP support.
+
+ Use shared libwebp from the target system.
+
+comment "Install options"
+
+config BR2_PACKAGE_OPENCV4_INSTALL_DATA
+ bool "install extra data"
+ help
+ Install various data that is used by cv libraries and/or
+ demo applications, specifically for haarcascades and
+ lbpcascades features.
+
+ For further information: see OpenCV documentation.
+
+endif # BR2_PACKAGE_OPENCV4
+
+comment "opencv4 needs a toolchain w/ C++, NPTL, wchar, dynamic library, gcc >= 4.8"
+ depends on BR2_TOOLCHAIN_HAS_ATOMIC
+ depends on !BR2_INSTALL_LIBSTDCPP || \
+ !BR2_USE_WCHAR || \
+ !BR2_TOOLCHAIN_HAS_THREADS_NPTL || \
+ BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
--- /dev/null
+################################################################################
+#
+# opencv4
+#
+################################################################################
+
+OPENCV4_VERSION = 4.5.1
+OPENCV4_SITE = $(call github,opencv,opencv,$(OPENCV4_VERSION))
+OPENCV4_INSTALL_STAGING = YES
+OPENCV4_LICENSE = Apache-2.0
+OPENCV4_LICENSE_FILES = LICENSE
+OPENCV4_SUPPORTS_IN_SOURCE_BUILD = NO
+
+OPENCV4_CXXFLAGS = $(TARGET_CXXFLAGS)
+
+# Uses __atomic_fetch_add_4
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+OPENCV4_CXXFLAGS += -latomic
+endif
+
+# Fix c++11 build with missing std::exception_ptr
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_64735),y)
+OPENCV4_CXXFLAGS += -DCV__EXCEPTION_PTR=0
+endif
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_68485),y)
+OPENCV4_CXXFLAGS += -O0
+endif
+
+# OpenCV component options
+OPENCV4_CONF_OPTS += \
+ -DCMAKE_CXX_FLAGS="$(OPENCV4_CXXFLAGS)" \
+ -DBUILD_DOCS=OFF \
+ -DBUILD_PERF_TESTS=$(if $(BR2_PACKAGE_OPENCV4_BUILD_PERF_TESTS),ON,OFF) \
+ -DBUILD_TESTS=$(if $(BR2_PACKAGE_OPENCV4_BUILD_TESTS),ON,OFF) \
+ -DBUILD_WITH_DEBUG_INFO=OFF \
+ -DDOWNLOAD_EXTERNAL_TEST_DATA=OFF \
+ -DOPENCV_GENERATE_PKGCONFIG=ON \
+ -DOPENCV_ENABLE_PKG_CONFIG=ON
+
+ifeq ($(BR2_PACKAGE_OPENCV4_BUILD_TESTS)$(BR2_PACKAGE_OPENCV4_BUILD_PERF_TESTS),)
+OPENCV4_CONF_OPTS += -DINSTALL_TEST=OFF
+else
+OPENCV4_CONF_OPTS += -DINSTALL_TEST=ON
+endif
+
+# OpenCV build options
+OPENCV4_CONF_OPTS += \
+ -DBUILD_WITH_STATIC_CRT=OFF \
+ -DENABLE_COVERAGE=OFF \
+ -DENABLE_FAST_MATH=ON \
+ -DENABLE_IMPL_COLLECTION=OFF \
+ -DENABLE_NOISY_WARNINGS=OFF \
+ -DENABLE_OMIT_FRAME_POINTER=ON \
+ -DENABLE_PRECOMPILED_HEADERS=OFF \
+ -DENABLE_PROFILING=OFF \
+ -DOPENCV_WARNINGS_ARE_ERRORS=OFF
+
+# OpenCV link options
+OPENCV4_CONF_OPTS += \
+ -DCMAKE_INSTALL_RPATH_USE_LINK_PATH=OFF \
+ -DCMAKE_SKIP_RPATH=OFF \
+ -DCMAKE_USE_RELATIVE_PATHS=OFF
+
+# OpenCV packaging options:
+OPENCV4_CONF_OPTS += \
+ -DBUILD_PACKAGE=OFF \
+ -DENABLE_SOLUTION_FOLDERS=OFF \
+ -DINSTALL_CREATE_DISTRIB=OFF
+
+# OpenCV module selection
+# * Modules on:
+# - core: if not set, opencv does not build anything
+# - hal: core's dependency
+# * Modules off:
+# - android*: android stuff
+# - apps: programs for training classifiers
+# - java: java bindings
+# - viz: missing VTK dependency
+# - world: all-in-one module
+#
+# * Contrib modules from [1] are disabled:
+# - opencv_contrib package is not available in Buildroot;
+# - OPENCV_EXTRA_MODULES_PATH is not set.
+#
+# [1] https://github.com/Itseez/opencv_contrib
+OPENCV4_CONF_OPTS += \
+ -DBUILD_opencv_androidcamera=OFF \
+ -DBUILD_opencv_apps=OFF \
+ -DBUILD_opencv_calib3d=$(if $(BR2_PACKAGE_OPENCV4_LIB_CALIB3D),ON,OFF) \
+ -DBUILD_opencv_core=ON \
+ -DBUILD_opencv_features2d=$(if $(BR2_PACKAGE_OPENCV4_LIB_FEATURES2D),ON,OFF) \
+ -DBUILD_opencv_flann=$(if $(BR2_PACKAGE_OPENCV4_LIB_FLANN),ON,OFF) \
+ -DBUILD_opencv_highgui=$(if $(BR2_PACKAGE_OPENCV4_LIB_HIGHGUI),ON,OFF) \
+ -DBUILD_opencv_imgcodecs=$(if $(BR2_PACKAGE_OPENCV4_LIB_IMGCODECS),ON,OFF) \
+ -DBUILD_opencv_imgproc=$(if $(BR2_PACKAGE_OPENCV4_LIB_IMGPROC),ON,OFF) \
+ -DBUILD_opencv_java=OFF \
+ -DBUILD_opencv_ml=$(if $(BR2_PACKAGE_OPENCV4_LIB_ML),ON,OFF) \
+ -DBUILD_opencv_objdetect=$(if $(BR2_PACKAGE_OPENCV4_LIB_OBJDETECT),ON,OFF) \
+ -DBUILD_opencv_photo=$(if $(BR2_PACKAGE_OPENCV4_LIB_PHOTO),ON,OFF) \
+ -DBUILD_opencv_shape=$(if $(BR2_PACKAGE_OPENCV4_LIB_SHAPE),ON,OFF) \
+ -DBUILD_opencv_stitching=$(if $(BR2_PACKAGE_OPENCV4_LIB_STITCHING),ON,OFF) \
+ -DBUILD_opencv_superres=$(if $(BR2_PACKAGE_OPENCV4_LIB_SUPERRES),ON,OFF) \
+ -DBUILD_opencv_ts=$(if $(BR2_PACKAGE_OPENCV4_LIB_TS),ON,OFF) \
+ -DBUILD_opencv_video=$(if $(BR2_PACKAGE_OPENCV4_LIB_VIDEO),ON,OFF) \
+ -DBUILD_opencv_videoio=$(if $(BR2_PACKAGE_OPENCV4_LIB_VIDEOIO),ON,OFF) \
+ -DBUILD_opencv_videostab=$(if $(BR2_PACKAGE_OPENCV4_LIB_VIDEOSTAB),ON,OFF) \
+ -DBUILD_opencv_viz=OFF \
+ -DBUILD_opencv_world=OFF
+
+# Hardware support options.
+#
+# * PowerPC and VFPv3 support are turned off since their only effects
+# are altering CFLAGS, adding '-mcpu=G3 -mtune=G5' or '-mfpu=vfpv3'
+# to them, which is already handled by Buildroot.
+# * NEON logic is needed as it is not only used to add CFLAGS, but
+# also to enable additional NEON code.
+OPENCV4_CONF_OPTS += \
+ -DENABLE_POWERPC=OFF \
+ -DENABLE_NEON=$(if $(BR2_ARM_CPU_HAS_NEON),ON,OFF) \
+ -DENABLE_VFPV3=OFF
+
+# Cuda stuff
+OPENCV4_CONF_OPTS += \
+ -DBUILD_CUDA_STUBS=OFF \
+ -DBUILD_opencv_cudaarithm=OFF \
+ -DBUILD_opencv_cudabgsegm=OFF \
+ -DBUILD_opencv_cudacodec=OFF \
+ -DBUILD_opencv_cudafeatures2d=OFF \
+ -DBUILD_opencv_cudafilters=OFF \
+ -DBUILD_opencv_cudaimgproc=OFF \
+ -DBUILD_opencv_cudalegacy=OFF \
+ -DBUILD_opencv_cudaobjdetect=OFF \
+ -DBUILD_opencv_cudaoptflow=OFF \
+ -DBUILD_opencv_cudastereo=OFF \
+ -DBUILD_opencv_cudawarping=OFF \
+ -DBUILD_opencv_cudev=OFF \
+ -DWITH_CUBLAS=OFF \
+ -DWITH_CUDA=OFF \
+ -DWITH_CUFFT=OFF
+
+# NVidia stuff
+OPENCV4_CONF_OPTS += -DWITH_NVCUVID=OFF
+
+# AMD stuff
+OPENCV4_CONF_OPTS += \
+ -DWITH_OPENCLAMDBLAS=OFF \
+ -DWITH_OPENCLAMDFFT=OFF
+
+# Intel stuff
+OPENCV4_CONF_OPTS += \
+ -DBUILD_WITH_DYNAMIC_IPP=OFF \
+ -DWITH_INTELPERC=OFF \
+ -DWITH_IPP=OFF \
+ -DWITH_IPP_A=OFF \
+ -DWITH_TBB=OFF
+
+# Smartek stuff
+OPENCV4_CONF_OPTS += -DWITH_GIGEAPI=OFF
+
+# Prosilica stuff
+OPENCV4_CONF_OPTS += -DWITH_PVAPI=OFF
+
+# Ximea stuff
+OPENCV4_CONF_OPTS += -DWITH_XIMEA=OFF
+
+# Non-Linux support (Android options) must remain OFF:
+OPENCV4_CONF_OPTS += \
+ -DANDROID=OFF \
+ -DBUILD_ANDROID_CAMERA_WRAPPER=OFF \
+ -DBUILD_ANDROID_EXAMPLES=OFF \
+ -DBUILD_ANDROID_SERVICE=OFF \
+ -DBUILD_FAT_JAVA_LIB=OFF \
+ -DINSTALL_ANDROID_EXAMPLES=OFF \
+ -DWITH_ANDROID_CAMERA=OFF
+
+# Non-Linux support (Mac OSX options) must remain OFF:
+OPENCV4_CONF_OPTS += \
+ -DWITH_AVFOUNDATION=OFF \
+ -DWITH_CARBON=OFF \
+ -DWITH_QUICKTIME=OFF
+
+# Non-Linux support (Windows options) must remain OFF:
+OPENCV4_CONF_OPTS += \
+ -DWITH_CSTRIPES=OFF \
+ -DWITH_DSHOW=OFF \
+ -DWITH_MSMF=OFF \
+ -DWITH_VFW=OFF \
+ -DWITH_VIDEOINPUT=OFF \
+ -DWITH_WIN32UI=OFF
+
+# Software/3rd-party support options:
+# - disable all examples
+OPENCV4_CONF_OPTS += \
+ -DBUILD_EXAMPLES=OFF \
+ -DBUILD_JASPER=OFF \
+ -DBUILD_JPEG=OFF \
+ -DBUILD_OPENEXR=OFF \
+ -DBUILD_OPENJPEG=OFF \
+ -DBUILD_PNG=OFF \
+ -DBUILD_PROTOBUF=OFF \
+ -DBUILD_TIFF=OFF \
+ -DBUILD_ZLIB=OFF \
+ -DINSTALL_C_EXAMPLES=OFF \
+ -DINSTALL_PYTHON_EXAMPLES=OFF \
+ -DINSTALL_TO_MANGLED_PATHS=OFF
+
+# Disabled features (mostly because they are not available in Buildroot), but
+# - eigen: OpenCV does not use it, not take any benefit from it.
+OPENCV4_CONF_OPTS += \
+ -DWITH_1394=OFF \
+ -DWITH_CLP=OFF \
+ -DWITH_EIGEN=OFF \
+ -DWITH_GDAL=OFF \
+ -DWITH_GPHOTO2=OFF \
+ -DWITH_GSTREAMER_0_10=OFF \
+ -DWITH_LAPACK=OFF \
+ -DWITH_MATLAB=OFF \
+ -DWITH_OPENCL=OFF \
+ -DWITH_OPENCL_SVM=OFF \
+ -DWITH_OPENEXR=OFF \
+ -DWITH_OPENNI2=OFF \
+ -DWITH_OPENNI=OFF \
+ -DWITH_UNICAP=OFF \
+ -DWITH_VA=OFF \
+ -DWITH_VA_INTEL=OFF \
+ -DWITH_VTK=OFF \
+ -DWITH_XINE=OFF
+
+OPENCV4_DEPENDENCIES += host-pkgconf zlib
+
+ifeq ($(BR2_PACKAGE_OPENCV4_JPEG2000_WITH_JASPER),y)
+OPENCV4_CONF_OPTS += -DWITH_JASPER=ON
+OPENCV4_DEPENDENCIES += jasper
+else
+OPENCV4_CONF_OPTS += -DWITH_JASPER=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_JPEG2000_WITH_OPENJPEG),y)
+OPENCV4_CONF_OPTS += -DWITH_OPENJPEG=ON
+OPENCV4_DEPENDENCIES += openjpeg
+else
+OPENCV4_CONF_OPTS += -DWITH_OPENJPEG=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_FFMPEG),y)
+OPENCV4_CONF_OPTS += -DWITH_FFMPEG=ON
+OPENCV4_DEPENDENCIES += ffmpeg bzip2
+else
+OPENCV4_CONF_OPTS += -DWITH_FFMPEG=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_GSTREAMER1),y)
+OPENCV4_CONF_OPTS += -DWITH_GSTREAMER=ON
+OPENCV4_DEPENDENCIES += gstreamer1 gst1-plugins-base
+else
+OPENCV4_CONF_OPTS += -DWITH_GSTREAMER=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_GTK)$(BR2_PACKAGE_OPENCV4_WITH_GTK3),)
+OPENCV4_CONF_OPTS += -DWITH_GTK=OFF -DWITH_GTK_2_X=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_GTK),y)
+OPENCV4_CONF_OPTS += -DWITH_GTK=ON -DWITH_GTK_2_X=ON
+OPENCV4_DEPENDENCIES += libgtk2
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_GTK3),y)
+OPENCV4_CONF_OPTS += -DWITH_GTK=ON -DWITH_GTK_2_X=OFF
+OPENCV4_DEPENDENCIES += libgtk3
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_JPEG),y)
+OPENCV4_CONF_OPTS += -DWITH_JPEG=ON
+OPENCV4_DEPENDENCIES += jpeg
+else
+OPENCV4_CONF_OPTS += -DWITH_JPEG=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_OPENGL),y)
+OPENCV4_CONF_OPTS += -DWITH_OPENGL=ON
+OPENCV4_DEPENDENCIES += libgl
+else
+OPENCV4_CONF_OPTS += -DWITH_OPENGL=OFF
+endif
+
+OPENCV4_CONF_OPTS += -DWITH_OPENMP=$(if $(BR2_TOOLCHAIN_HAS_OPENMP),ON,OFF)
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_PNG),y)
+OPENCV4_CONF_OPTS += -DWITH_PNG=ON
+OPENCV4_DEPENDENCIES += libpng
+else
+OPENCV4_CONF_OPTS += -DWITH_PNG=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_PROTOBUF),y)
+OPENCV4_CONF_OPTS += \
+ -DPROTOBUF_UPDATE_FILES=ON \
+ -DWITH_PROTOBUF=ON
+OPENCV4_DEPENDENCIES += protobuf
+else
+OPENCV4_CONF_OPTS += -DWITH_PROTOBUF=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_QT5),y)
+OPENCV4_CONF_OPTS += -DWITH_QT=5
+OPENCV4_DEPENDENCIES += qt5base
+else
+OPENCV4_CONF_OPTS += -DWITH_QT=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_TIFF),y)
+OPENCV4_CONF_OPTS += -DWITH_TIFF=ON
+OPENCV4_DEPENDENCIES += tiff
+else
+OPENCV4_CONF_OPTS += -DWITH_TIFF=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_V4L),y)
+OPENCV4_CONF_OPTS += \
+ -DWITH_LIBV4L=$(if $(BR2_PACKAGE_LIBV4L),ON,OFF) \
+ -DWITH_V4L=ON
+OPENCV4_DEPENDENCIES += $(if $(BR2_PACKAGE_LIBV4L),libv4l)
+else
+OPENCV4_CONF_OPTS += -DWITH_V4L=OFF -DWITH_LIBV4L=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_WITH_WEBP),y)
+OPENCV4_CONF_OPTS += -DWITH_WEBP=ON
+OPENCV4_DEPENDENCIES += webp
+else
+OPENCV4_CONF_OPTS += -DWITH_WEBP=OFF
+endif
+
+ifeq ($(BR2_PACKAGE_OPENCV4_LIB_PYTHON),y)
+OPENCV4_CONF_OPTS += \
+ -DBUILD_opencv_python2=OFF \
+ -DBUILD_opencv_python3=ON \
+ -DPYTHON3_EXECUTABLE=$(HOST_DIR)/bin/python3 \
+ -DPYTHON3_INCLUDE_PATH=$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR) \
+ -DPYTHON3_LIBRARIES=$(STAGING_DIR)/usr/lib/libpython$(PYTHON3_VERSION_MAJOR).so \
+ -DPYTHON3_NUMPY_INCLUDE_DIRS=$(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/numpy/core/include \
+ -DPYTHON3_PACKAGES_PATH=/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages \
+ -DPYTHON3_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
+OPENCV4_DEPENDENCIES += python3
+OPENCV4_KEEP_PY_FILES += usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/cv2/config*.py
+OPENCV4_CONF_ENV += $(PKG_PYTHON_DISTUTILS_ENV)
+OPENCV4_DEPENDENCIES += python-numpy
+else
+OPENCV4_CONF_OPTS += \
+ -DBUILD_opencv_python2=OFF \
+ -DBUILD_opencv_python3=OFF
+endif
+
+# Installation hooks:
+define OPENCV4_CLEAN_INSTALL_LICENSE
+ $(RM) -fr $(TARGET_DIR)/usr/share/licenses/opencv4
+endef
+OPENCV4_POST_INSTALL_TARGET_HOOKS += OPENCV4_CLEAN_INSTALL_LICENSE
+
+define OPENCV4_CLEAN_INSTALL_VALGRIND
+ $(RM) -f $(TARGET_DIR)/usr/share/opencv4/valgrind*
+endef
+OPENCV4_POST_INSTALL_TARGET_HOOKS += OPENCV4_CLEAN_INSTALL_VALGRIND
+
+ifneq ($(BR2_PACKAGE_OPENCV4_INSTALL_DATA),y)
+define OPENCV4_CLEAN_INSTALL_DATA
+ $(RM) -fr $(TARGET_DIR)/usr/share/opencv4/haarcascades \
+ $(TARGET_DIR)/usr/share/opencv4/lbpcascades
+endef
+OPENCV4_POST_INSTALL_TARGET_HOOKS += OPENCV4_CLEAN_INSTALL_DATA
+endif
+
+$(eval $(cmake-package))
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