install xpdf-common planner regina3-dev isdnutils-doc mailagent
Reading package lists...
Building dependency tree...
Reading state information...
Reading extended state information...
Initializing package states...
The following NEW packages will be installed:
  isdnutils-doc [1:3.6.2005-01-03-5]  mailagent [3.73-17]  
  regina3{a} [3.3-1]  regina3-dev [3.3-1]  xpdf-common [3.00-13.7]  
0 packages upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 1635 kB of archives. After unpacking 5448 kB will be used.
WARNING: untrusted versions of the following packages will be installed!

Untrusted packages could compromise your system's security.
You should only proceed with the installation if you are certain that
this is what you want to do.

  regina3-dev isdnutils-doc mailagent regina3 xpdf-common 

Do you want to ignore this warning and proceed anyway?
To continue, enter "Yes"; to abort, enter "No": Abort.