So this is the first issue that comes up while trying to install the developer version...
root@webserver:~# apt-get install subversion
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package subversion is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'subversion' has no installation candidate