anchor.diff:  SRCREV_boostdesc = "34e4206aef44d50e6bbcd0ab06354b52e7466d26"
   SRCREV_vgg = "fccf7cd6a4b12079f73bbfb21745f9babcd4eb1d"
   SRCREV_face = "8afa57abc8229d611c4937165d20e2a2d9fc5a12"
  +SRCREV_wechat-qrcode = "a8b69ccc738421293254aec5ddb38bd523503252"
   
   def ipp_filename(d):
       import re
  
positive.code:     cache xfeatures2d/boostdesc ${WORKDIR}/boostdesc/*.i
      cache xfeatures2d/vgg ${WORKDIR}/vgg/*.i
      cache data ${WORKDIR}/face/*.dat
  }
  addtask unpack_extra after do_unpack before do_patch
  
  
negative.code:            git://github.com/opencv/opencv_3rdparty.git;branch=contrib_xfeatures2d_boostdesc_20161012;destsuffix=boostdesc;name=boostdesc \
             git://github.com/opencv/opencv_3rdparty.git;branch=contrib_xfeatures2d_vgg_20160317;destsuffix=vgg;name=vgg \
             git://github.com/opencv/opencv_3rdparty.git;branch=contrib_face_alignment_20170818;destsuffix=face;name=face \
             git://github.com/WeChatCV/opencv_3rdparty.git;branch=wechat_qrcode;destsuffix=wechat_qrcode;name=wechat-qrcode \
             file://0001-3rdparty-ippicv-Use-pre-downloaded-ipp.patch \
             file://0003-To-fix-errors-as-following.patch \
             file://0001-Temporarliy-work-around-deprecated-ffmpeg-RAW-functi.patch \
  