It looks like it's coming from JsonCpp:
https://github.com/open-source-parsers/jsoncpp/blob/0.y.z/src/lib_json/CMakeLists.txt#L51

I just checked, CMAKE_LIBRARY_ARCHITECTURE values is "" on windows (MSVC).
I don't think MAC will face the issue since it's fixed up.

I would be in favor of adding a step in SlicerCPack.cmake to move the JSonCpp libraries to the correct folder but that's far from ideal.

What do you guys think is the best ?

I can confirm this issue only happens on linux, not mac or windows.

Moving the files during the install step is probably the easiest workaround but sounds like it's just asking for future headaches. Why not fork jsoncpp into the Slicer organization on github and add a commit that allows overriding this intermediate directory.

We can offer this as a pull request upstream and ideally it would be accepted so we wouldn't need to worry about it again.

If they don't accept it we can stick with using our own fork and then know that we need to explicitly handle this case if/when moving to a new jsoncpp upstream version.

@pieper: I agree with you. This is a better idea.

I don't have permission to create a fork. If someone sets it up, I don't mind creating the necessary commit.

Thanks Johan - I set up the fork and added the Slicer Core team to it so I think you have what you need, but let me know if there's anything else.

https://github.com/Slicer/jsoncpp

Fix has been pushed on the Slicer fork.
See https://github.com/Slicer/jsoncpp/tree/slicer-v0.10.6-2016-04-22

Testing locally, I will integrate shortly.

Fixed in http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=25465

Thanks for helping out with this one JC !

Backported to Slicer-4-6 branch as http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=25510

Integrated in 4.6.1

Confirmed - thanks!