PPTP is the Point to Point Tunneling Protocol, and is very often used to dail in to xDSL connections.
pppd does not support PPTP right out of the box, you need a seperate prorgam for that. The program can be found at sourceforge and is currently at version 1.4.0.

There are no options, and compilation should be painless. Again, use strip -g to make the file smaller.

If you check the library dependencies of the executable, you see libutil is not yet on our image. It is part of the standard C libraries, so we allready have it, and just have to copy it.