container wont build

[keen99]

attempting to build this container:

docker build -rm -t keen99/hobbit https://github.com/sillkongen/docker-hobbit.git

results in this error:

The following information may help to resolve the situation:

The following packages have unmet dependencies:
 xymon : Depends: librrd4 (>= 1.3.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
2014/07/23 18:51:46 The command [/bin/sh -c apt-get install -y hobbit apache2 wget nano python-setuptools] returned a non-zero code: 100

I'm assuming there's a package dependency problem somewhere?

full output:

mini:~/tmp%% docker build -rm -t keen99/hobbit https://github.com/sillkongen/docker-hobbit.git
Warning: '-rm' is deprecated, it will be replaced by '--rm' soon. See usage.
Sending build context to Docker daemon 128.5 kB
Sending build context to Docker daemon
Step 0 : FROM ubuntu:latest
 ---> ba5877dc9bec
Step 1 : MAINTAINER Oskar Agustsson <oskar.agustsson@gmail.com>
 ---> Using cache
 ---> 0ffa0c33ce5c
Step 2 : RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
 ---> Using cache
 ---> dd65b940d4c9
Step 3 : RUN apt-get update # Tue 21 Jan 2014 16:07:00 CET
 ---> Using cache
 ---> 6fbdaa961cf2
Step 4 : RUN apt-get -y upgrade
 ---> Using cache
 ---> 882404e153af
Step 5 : RUN apt-get install -y hobbit apache2 wget nano python-setuptools
 ---> Running in 01ff35e48b67
Reading package lists...
Building dependency tree...
Reading state information...
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:
 xymon : Depends: librrd4 (>= 1.3.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
2014/07/23 18:56:24 The command [/bin/sh -c apt-get install -y hobbit apache2 wget nano python-setuptools] returned a non-zero code: 100