The beosc opcode is part of the beosc plugin. This is an external plugin and is not part of the csound distribution. The plugin can be installed via risset (https://github.com/csound-plugins/risset)

In Ubuntu, starting from 22.04 the recommended way of doing that is to install risset via pipx

$ sudo apt install pipx
$ pipx install risset
$ risset install beosc

cheers,
Eduardo

On 08.09.23 11:32, Stefan Thomas  wrote:
> Dear community,
> I've installed the csound-plugins using apt install on my ubuntu machine.
> Unfortunately I can't use them.
> Neither can I see the new opcodes when I type csound -z nor can I 
> compile a patch like 
> https://csound-plugins.github.io/csound-plugins/opcodes/beosc.html#examples 
> How can I get the plugins up and running?
> Thanks,
> Stefan
> Csound mailing list Csound@listserv.heanet.ie 
>  
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND 
>  Send bugs reports to 
> https://github.com/csound/csound/issues 
>  Discussions of bugs and 
> features can be posted here
> 

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