You must compile additional software to use Postcards 2.5
These utilities may already be installed on your system, contact your
system administrator. You may also be able to find and download precompiled
versions of the utilities which can be installed in your own disk area.
The NetPBM Utilities
Independent JPEG Group JPEG software
Code from the PNG Development Group
If you can't or won't install the additional software, you will
lose the corresponding functions.