Public bug reported:

OpenCL is not enabled by default.

Steps to reproduce :
 * install the nvidia driver
 * install darktable
 * run darktable on command line : $darktable -d opencl

[opencl_init] could not find opencl runtime library 'libOpenCL'
0.159268 [opencl_init] could not find opencl runtime library ''
0.159327 [opencl_init] could not find opencl runtime library ''
0.159333 [opencl_init] no working opencl library found. Continue with opencl 
0.159336 [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.

Workaround : install package nvidia-opencl-dev

Should darktable depend on nvidia-opencl-dev ?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: darktable 2.4.2-1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 10 23:49:56 2018
InstallationDate: Installed on 2018-04-09 (1 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180407)
 PATH=(custom, no user)
SourcePackage: darktable
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: darktable (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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  OpenCL disabled on nvidia

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