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dolfin requires both ufc and ffc, which can not coexist
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aharel
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PostPosted: Thu Feb 11, 2016 10:36 am    Post subject: dolfin requires both ufc and ffc, which can not coexist Reply with quote

Hello,

I'm trying to install FEniCS, or more specifically, its dolfin interface.
I found sci-mathematics/dolfin.
As preliminaries, I updated my system (and @world set), installed sci-libs/cholmod and sci-mathematics/cgal, and added the use flags to dolfin so it uses those two packages (*).

emerge fails since dolfin pulls in both sci-mathematics/ufc and dev-python/ffc, which can not coexist. They seem to offer similar functionality. Perhaps dev-python/ffc is the official replacement for the unofficial sci-mathematics/ufc and the dolfin ebuild is out of date?

Any ideas how to overcome this?
(highlights from emerge's output are below)

(*) the same block was present before I installed choldmod and cgal and set the use flags to use them.

many thanks,
Amnon

Quote:

[blocks B ] sci-mathematics/ufc ("sci-mathematics/ufc" is blocking dev-python/ffc-1.4.0)
...
* Error: The above package list contains packages which cannot be
* installed at the same time on the same system.

(dev-python/ffc-1.4.0:0/0::science, ebuild scheduled for merge) pulled in by
dev-python/ffc[python_targets_python2_7(-)?,-python_single_target_jython2_7(-),-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python3_3(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),python_single_target_python2_7(+)] (dev-python/ffc[python_targets_python2_7(-),-python_single_target_jython2_7(-),-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python3_3(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),python_single_target_python2_7(+)]) required by (sci-mathematics/dolfin-0.9.9:0/0::science, ebuild scheduled for merge)

(sci-mathematics/ufc-2.3.0:0/0::science, installed) pulled in by
sci-mathematics/ufc required by (sci-mathematics/dolfin-0.9.9:0/0::science, ebuild scheduled for merge)
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Ant P.
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PostPosted: Fri Feb 12, 2016 12:52 pm    Post subject: Reply with quote

You can work around it with USE="-python", though I've no idea whether it's needed for any important functionality.
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aharel
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PostPosted: Fri Feb 12, 2016 1:57 pm    Post subject: The python interface is exactly what I need... Reply with quote

Thanks for the suggestion Ant P.
As it happens, the python interface is exactly what I need, so your advice will not work for my case.

Looking a bit more into it, the dolfin ebuild looks hopelessly outdated:
1. "ufc" is a deprecated component of dolfin, which was replaced with "ffc" in 2014.
2. As far as I can tell, the ebuild is basically from 2010.

FEniCS's idea of "installation from source" is to install another package manager, hashdist, and build from it. This seems like anathema to a gentoo system. But I guess that's the only way to go forward with this. At least I saw it working on Fedora.
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