Error: /usr/bin/ld: cannot find -lmkldnn (Build Intel Caffe using gcc)

[donghn]

I followed https://github.com/intel/caffe/wiki/Install-Intel-Caffe to build intel-caffe.
Using gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609

Command line:
cd caffe
scripts/prepare_env.sh --compiler gcc

I got the error:
CXX examples/cpp_classification/classification.cpp
AR -o .build_release/lib/libcaffe.a
LD -o .build_release/lib/libcaffe.so.1.1.6
/usr/bin/ld: cannot find -lmkldnn
collect2: error: ld returned 1 exit status
Makefile:806: recipe for target '.build_release/lib/libcaffe.so.1.1.6' failed
make: *** [.build_release/lib/libcaffe.so.1.1.6] Error 1
make: *** Waiting for unfinished jobs....
make: command: Command not found
MKLDNN download is enabled by customized setting!
weight grad compression disabled because intel compiler not found
LD -o .build_release/lib/libcaffe.so.1.1.6
/usr/bin/ld: cannot find -lmkldnn
collect2: error: ld returned 1 exit status
Makefile:806: recipe for target '.build_release/lib/libcaffe.so.1.1.6' failed
make: *** [.build_release/lib/libcaffe.so.1.1.6] Error 1
Done.

How can I resolve it?

[ftian1]

mkldnn has changed its .so location, which is under lib64 under centos, lib under ubuntu.

as you are using prepare_env.sh with gcc compiler, it will go to make path rather than cmake. so you have to manually update Makefile.mkldnn line 66/67/74 to use "lib" dir path rather than "lib64".

another way is to directly use cmake. the steps are:

mkdir build
cd build
cmake .. && make -j 8

[donghn]

thank you for your help.

[hundanLi]

Also work for me.