I found the reason for the failure using strace on configure:
/etc/ld-musl-x86_64.path was missing. I added it with the path to my libs
and then it worked.

2015-11-18 13:39 GMT+01:00 Szabolcs Nagy <nsz@port70.net>:

> * Frieder Berthold <berthold.frieder@googlemail.com> [2015-11-18 12:19:26
> +0100]:
> > In configure it states that it can't find the libz.so, which is the
> reason
> > for termination.
> >
>
> you have to check the failing command, it is really possible
> that it has nothing to do with libz.so, so there is no point
> speculating about the right path until you know what went
> wrong.
>
> there is a configure.log which should show the command that
> failed, so you should be able to reproduce the failure
> and then see the searched paths etc.
>