Ubuntu 12.04: ld cannot find library

Question

I'm trying to compile Caffe (http://caffe.berkeleyvision.org/installation.html) and I get the following errors:

/usr/bin/ld: cannot find -lcblas
/usr/bin/ld: cannot find -latlas

However, I have these libraries installed (libatlas). My LD_LIBRARY_PATH contains the path /usr/lib/atlas-base and it contains the files libcblas.so and libatlas.so (and some other files as well).

Why ld can't find these libraries? Thanks.

Answer 1

It turns out I had to run

sudo update-alternatives --config libblas.so
sudo update-alternatives --config liblapack.so

and to select libatlas . I have no idea why,. If anyone can explain this me I will give him the answer. Thanks.

Answer 2

sudo apt-get install libatlas-base-dev worked for me, it removed both missing dependencies.

See this thread for additional details https://github.com/BVLC/caffe/issues/559