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External protobuf is used instead of embedded one since commit31c68a449e. However it fails to build on: [ 63%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/misc/caffe/opencv-caffe.pb.cc.o In file included from /home/naourr/work/instance-0/output-1/build/opencv3-3.4.9/modules/dnn/misc/caffe/opencv-caffe.pb.cc:4: /home/naourr/work/instance-0/output-1/build/opencv3-3.4.9/modules/dnn/misc/caffe/opencv-caffe.pb.h:17:2: error: #error This file was generated by an older version of protoc which is 17 | #error This file was generated by an older version of protoc which is | ^~~~~ /home/naourr/work/instance-0/output-1/build/opencv3-3.4.9/modules/dnn/misc/caffe/opencv-caffe.pb.h:18:2: error: #error incompatible with your Protocol Buffer headers. Please 18 | #error incompatible with your Protocol Buffer headers. Please | ^~~~~ /home/naourr/work/instance-0/output-1/build/opencv3-3.4.9/modules/dnn/misc/caffe/opencv-caffe.pb.h:19:2: error: #error regenerate this file with a newer version of protoc. 19 | #error regenerate this file with a newer version of protoc. | ^~~~~ /home/naourr/work/instance-0/output-1/build/opencv3-3.4.9/modules/dnn/misc/caffe/opencv-caffe.pb.cc:12:10: fatal error: google/protobuf/wire_format_lite_inl.h: No such file or directory 12 | #include <google/protobuf/wire_format_lite_inl.h> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix this error by setting PROTOBUF_UPDATE_FILES to ON Fixes: - http://autobuild.buildroot.org/results/219258c90709fc34748929f1dcdf4f0649215e61 Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> (cherry picked from commitad6a0d0d65) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>