Issue in installing PyOpenCL

Question

I'm trying to install PyOpenCL on Ubuntu 16.04, but getting the following error:

/usr/bin/ld: cannot find -lOpenCL
collect2: error: ld returned 1 exit status
error: command 'c++' failed with exit status 1

How can I solve this issue?

Thanks.

Answer 1

You need to install: ocl-icd-opencl-dev

apt-get install ocl-icd-opencl-dev

You can check what was actually installed with that package running:

$ dpkg -L ocl-icd-opencl-dev

which should return something along these lines:

/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/ocl-icd-opencl-dev
/usr/share/doc/ocl-icd-opencl-dev/copyright
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/pkgconfig
/usr/lib/x86_64-linux-gnu/pkgconfig/OpenCL.pc
/usr/share/doc/ocl-icd-opencl-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libOpenCL.so  # <--- this is the important bit

---

Bonus

If you get a complaint about missing headers, e.g CL/cl.h, then you should install:

apt-get install opencl-headers.

Don't forget to install specific OpenCL drivers for your platform. You could be running against an Intel CPU/GPU, an AMD or NVidia graphics card or even an FPGA.

A good way of checking everything is well setup, is to run clinfo which will show useful information about available platforms (apt-get install clinfo).