/usr/bin/ld: cannot find -lopencv_imgcodecs

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On $ sudo make all,

...

CXX src/caffe/layer_factory.cpp

CXX src/caffe/blob.cpp

AR -o .build_release/lib/libcaffe.a

LD -o .build_release/lib/libcaffe.so.1.0.0

/usr/bin/ld: cannot find -lopencv_imgcodecs

collect2: error: ld returned 1 exit status

Makefile:572: recipe for target '.build_release/lib/libcaffe.so.1.0.0' failed

make: *** [.build_release/lib/libcaffe.so.1.0.0] Error 1

on $ sudo apt install libopencv-dev,

...

libopencv-dev is already the newest version (2.4.9.1+dfsg1-2).

...

Have I installed the right library (libopencv-dev)? If not, which is the right package? If yes, how do I get ld to find opencv?

Distributor ID: Debian

Description:    Debian GNU/Linux 9.3 (stretch)

Release:        9.3

Codename:       stretch

[ningy...@gmail.com]

$ pkg-config opencv --libs

/usr/lib/x86_64-linux-gnu/libopencv_calib3d.so -lopencv_calib3d /usr/lib/x86_64-linux-gnu/libopencv_contrib.so -lopencv_contrib /usr/lib/x86_64-linux-gnu/libopencv_core.so -lopencv_core /usr/lib/x86_64-linux-gnu/libopencv_features2d.so -lopencv_features2d /usr/lib/x86_64-linux-gnu/libopencv_flann.so -lopencv_flann /usr/lib/x86_64-linux-gnu/libopencv_gpu.so -lopencv_gpu /usr/lib/x86_64-linux-gnu/libopencv_highgui.so -lopencv_highgui /usr/lib/x86_64-linux-gnu/libopencv_imgproc.so -lopencv_imgproc /usr/lib/x86_64-linux-gnu/libopencv_legacy.so -lopencv_legacy /usr/lib/x86_64-linux-gnu/libopencv_ml.so -lopencv_ml /usr/lib/x86_64-linux-gnu/libopencv_objdetect.so -lopencv_objdetect /usr/lib/x86_64-linux-gnu/libopencv_ocl.so -lopencv_ocl /usr/lib/x86_64-linux-gnu/libopencv_photo.so -lopencv_photo /usr/lib/x86_64-linux-gnu/libopencv_stitching.so -lopencv_stitching /usr/lib/x86_64-linux-gnu/libopencv_superres.so -lopencv_superres /usr/lib/x86_64-linux-gnu/libopencv_ts.so -lopencv_ts /usr/lib/x86_64-linux-gnu/libopencv_video.so -lopencv_video /usr/lib/x86_64-linux-gnu/libopencv_videostab.so -lopencv_videostab

[ningy...@gmail.com]

Those from the future:

I was using opencv version 2+, but the option "OPENCV_VERSION := 3" was NOT commented out in my Makefile.conf. Comment that out.