deb     http://deb.kamailio.org/kamailio51 stretch main
deb-src http://deb.kamailio.org/kamailio51 stretch main

Installable on debain stretch?

I'm getting:

# apt-get install kamailio kamailio-xmlrpc-modules kamailio-mysql-modules
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'kamailio-xml-modules' instead of 'kamailio-xmlrpc-modules'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 kamailio : Depends: libreadline7 (>= 6.0) but it is not installable
 kamailio-mysql-modules : Depends: libmariadbclient18 (>= 5.5.36) but it is not installable
E: Unable to correct problems, you have held broken packages.

#

but libreadline7 is not avaiable on stretch.

Thanks

David