Poptop is currently maintained by giovanni@. You could contact him, but .... you will likely be told to go upgrade your system. Here's why:
- You are running an unsupported -release.
- At your -release, poptop was 1.1.4-b4, from 2004.
- It was updated to 1.3.0 in 2008, which was prior to 4.3-release.
- It was updated to 1.3.4 in January, in time for 4.5-release.
- 4.6 is being released in less than three weeks.
And while your base OS might be working fine, you are asking for support of a version of an application for it, that, quite likely, no one is running today.
But ... the purpose of an OS is to run applications, isn't it? And you can't run this application, can you? -I- wouldn't describe that as running fine.
By the way, PPTP is generally not considered a secure VPN technology -- due to Microsoft's implementation of it -- in comparison to SSL-based or IPSec-based VPNs. See
http://www.schneier.com/pptp-faq.html for an opening discussion.