Thank you Michael.

yes. I have sometnihg with my system.
yaourt and PKGBUILD are ok.
I have to remove some lines about cwiid in ..libs/surfaces/wscript and it builds nicely.
Now I have ardour3 installed.

I am kinda new in using ardour. Till now I used ardour2 and I was happy. Are there some problems using ardour3 ? Because I see that it is 3.0rc2.

[update]
ahh. just now reinstalled from cwiid to cwiid-git and ardourd3 builds like a charm.

thanks

fero