root@debian:~# apt-get install pptpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libpcre3-dev : Depends: libpcre3 (= 8.02-1.1) but 7.8-3 is to be installed
pptpd : Depends: ppp (>= 2.4.5-3) but it is not going to be installed
Depends: bcrelay but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).