Darktable already builds for OpenCL support in Debian. This is what I
get after installing ocl-icd-libopencl1:

anarcat@marcos:~$ darktable -d opencl
[opencl_init] opencl related configuration options:
[opencl_init]
[opencl_init] opencl: 0
[opencl_init] opencl_library: ''
[opencl_init] opencl_memory_requirement: 768
[opencl_init] opencl_memory_headroom: 300
[opencl_init] opencl_device_priority: '*/!0,*/*/*'
[opencl_init] opencl_size_roundup: 16
[opencl_init] opencl_async_pixelpipe: 0
[opencl_init] opencl_synch_cache: 0
[opencl_init] opencl_number_event_handles: 25
[opencl_init] opencl_micro_nap: 1000
[opencl_init] opencl_avoid_atomics: 0
[opencl_init] opencl_omit_whitebalance: 0
[opencl_init]
[opencl_init] trying to load opencl library: '<system default>'
[opencl_init] opencl library 'libOpenCL' found on your system and loaded
[opencl_init] could not get platforms: -1001
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.

It says not available because there are no OpenCL libraries for Intel on
Debian, because they are non-free software (not even distributable). And
anyways, i would need 1GB+ of video RAM, which I really don't have here.

See also:

http://lists.debian.org/debian-devel/2012/06/msg01108.html

A.
-- 
Si Dieu est, l'homme est esclave ; 
or l'homme peut, doit ĂȘtre libre, donc Dieu n'existe pas.
Et si Dieu existait, il faudrait s'en débarrasser!
                        - Michel Bakounine

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