[Modules] [auth_xradius] dbm cache does not work

[Gunnar Thielebein]

We use the xradius plugin with dbm auth cache and a timeout of 3600.
whenever xradius Authentication is enabled the page does not get open.
As of the fetched error messages there are no other errors in apache log

I tried to build the memcache module because it states to be more thread 
safe but am getting this error:

> creating libapr_memcache.la
> (cd .libs && rm -f libapr_memcache.la && ln -s ../libapr_memcache.la libapr_memcache.la)
> make[1]: Leaving directory `/usr/src/xradius/apr_memcache-0.7.0/memcache'
> make[1]: Entering directory `/usr/src/xradius/apr_memcache-0.7.0'
> make[1]: Nothing to be done for `all-am'.
> make[1]: Leaving directory `/usr/src/xradius/apr_memcache-0.7.0'

Can someone assist?