On 13/12/18 8:56 AM, Alan Braslau wrote:
> On Wed, 12 Dec 2018 20:42:56 +0100
> "Mikael P. Sundqvist" <mic...@gmail.com> wrote:
>>
>> Thanks, Alan! That looks very promising. I could not make it work,
>> though, and I guess that is because I use linux and do not know what
>> to change for what. I installed libcerf but I assume something else is
>> missing. In any case, this is one of the things it would be nice to
>> have, at least as a module. I have no idea on how to realize that,
>> though.
>>
>> /Mikael
> 
> You likely also need to install libffi - I do not know what package
> this is on your flavor of linux - Luigi is the ffi specialist!

FFI is integrated in LuaTeX >= 1.03

In you example you load libcerf but you are not using it.  What you are
actually using are the Bessel function from the C Standard library.  GCC
includes them as a GNU extension.
https://www.gnu.org/software/libc/manual/html_node/Special-Functions.html#index-j0
Your example also works if you remove libcerf (at least for me on Linux).

> 
> Alan
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