Elmerfem installs its own copy of ARPACK

[Schamschula]

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I've been trying to install ElmerFEM under MacPorts. I have no problem building the package (I haven't tried all optional variants), but I have a failure when activating:

elmerfem tries to install /opt/local/lib/libarpack.dylib

which conflicts with the MacPorts arpack package, which has numerous dependent package in my case.

Unfortunately, cmake is not set up to test for arpack and add the correct path/library to the link settings.

In src/mathlibs/CMakeLists.txt there only is ADD_SUBDIRECTORY(arpack)which then builds the local version of arpack.

[raback]

ARPAKC has been a part of Elmer for a long time and I think the API has been tailored for Elmer needs. Also some bugs have been fixed (probably these have been fixed in the main branch as well). Therefore it could be a larger project to take use of the external ARPACK. Do you need the eigenmode solver? It would probably be easier to make Elmer skip the local arpack routines.

[juhanikataja]

ARPACK should get installed under lib/elmersolver/ instead of just lib/.