rdup is a small program, which depends on a number of a other programs
and tools to make it all work. The dependencies are listed here:

Mandatory:
o libglib (core C gtk library)
o libpcre (Perl regular expressions)

To build:
o automake
o autoconf

Some very small shell scripts are included in the sh/ directory
they depend on bash and GNU date and GNU cp.

rdup-tr has an extra dependency on
o libarchive 

If libarchive is not found rdup-tr is not built.

rdup-up has an extra dependencies on
o lbnettle

If libnettle is not found rdup-up will not be able to do
path encryption (-X/-Y options).
