apt-get install gcc fails ReadyNAS Pro with 4.2.27

Any ideas? I can get it down to this point, but then it tells me there are no candidates available.

sandbox:/c# apt-get install gcc-4.3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  gcc-4.3: Depends: cpp-4.3 (= 4.3.2-1.1) but it is not going to be installed
E: Broken packages
sandbox:/c# apt-get install gcc-4.3 cpp-4.3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  cpp-4.3: Depends: libmpfr1ldbl but it is not installable
E: Broken packages
sandbox:/c# apt-get install gcc-4.3 cpp-4.3

Here's my sources.list

deb http://www.readynas.com/packages 4.2.27/
deb http://archive.debian.org/debian etch main
#deb http://archive.debian.org/debian-backports etch-backports main non-free