Sometimes you can be so lost with a simple problem.
What I should have done right away is look at the arch install page of Audacious-plugins There you see as optional dependencie libcue. Seem to have missed that installing audacious. so
#pacman -S libcue
ended my misery.
Ouch, all is well that ends well but a pity for the time I lost so much time with this. Still stupid, or getting more stupid??
