opencv安装

opencv pcl Ros安装顺序为：ROS 然后后面两个，因为ROS会自动下载一些依赖 比如VTK等。

下载opencv-4.6.0与opencv_contrib-4.6.0

在opencv-4.6.0目录下新建build，build内：
 cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=/home/lc/Documents/opencv_contrib-4.6.0/modules -DWITH_VTK=ON ..

make -j8
sudo make install

问题一：
ippicv解压后将里面的大部分注释掉
/opencv/3rdparty/ippicv/ippicv.cmake

function(download_ippicv root_var)
  set(${root_var} "" PARENT_SCOPE)

  # Commit SHA in the opencv_3rdparty repo
  #  set(IPPICV_COMMIT "a56b6ac6f030c312b2dce17430eef13aed9af274")
  # Define actual ICV versions
  #  if(APPLE)
  #    set(OPENCV_ICV_PLATFORM "macosx")
  #    set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_mac")
  #    set(OPENCV_ICV_NAME "ippicv_2020_mac_intel64_20191018_general.tgz")
  #    set(OPENCV_ICV_HASH "1c3d675c2a2395d094d523024896e01b")
  #  elseif((UNIX AND NOT ANDROID) OR (UNIX AND ANDROID_ABI MATCHES "x86"))
  #    set(OPENCV_ICV_PLATFORM "linux")
    set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_lnx")
  #    if(X86_64)
  #      set(OPENCV_ICV_NAME "ippicv_2020_lnx_intel64_20191018_general.tgz")
  #      set(OPENCV_ICV_HASH "7421de0095c7a39162ae13a6098782f9")
  #    else()
  #      set(OPENCV_ICV_NAME "ippicv_2020_lnx_ia32_20191018_general.tgz")
  #      set(OPENCV_ICV_HASH "ad189a940fb60eb71f291321322fe3e8")
  #    endif()
  #  elseif(WIN32 AND NOT ARM)
  #  set(OPENCV_ICV_PLATFORM "windows")
  #   set(OPENCV_ICV_PACKAGE_SUBDIR "ippicv_win")
  #   if(X86_64)
  #     set(OPENCV_ICV_NAME "ippicv_2020_win_intel64_20191018_general.zip")
  #     set(OPENCV_ICV_HASH "879741a7946b814455eee6c6ffde2984")
  #    else()
  #      set(OPENCV_ICV_NAME "ippicv_2020_win_ia32_20191018_general.zip")
  #      set(OPENCV_ICV_HASH "cd39bdf0c2e1cac9a61101dad7a2413e")
  #    endif()
  #  else()
  #    return()
  #  endif()

  set(THE_ROOT "${OpenCV_BINARY_DIR}/3rdparty/ippicv")
  #  ocv_download(FILENAME ${OPENCV_ICV_NAME}
  #               HASH ${OPENCV_ICV_HASH}
  #               URL
  #                 "${OPENCV_IPPICV_URL}"
  #                 "$ENV{OPENCV_IPPICV_URL}"
  #                 "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}/ippicv/"
  #               DESTINATION_DIR "${THE_ROOT}"
  #               ID IPPICV
  #               STATUS res
  #               UNPACK RELATIVE_URL)

  if(res)
    set(${root_var} "${THE_ROOT}/${OPENCV_ICV_PACKAGE_SUBDIR}" PARENT_SCOPE)
  endif()
endfunction()

然后解压自己下载好的包在这个目录下，文件名要是里面的ippicv_lnx

其他问题：
编译时却头文件，缺啥装啥

sudo apt-get install lib-XXX 或sudo apt-get install XXX