I recently released a package for the first time and it's failing on the Travis build farm and i'm having some trouble figuring out why. The Ubuntu 16.04 build can be found [here](http://build.ros.org/job/Kdev__rdl__ubuntu_xenial_amd64/lastBuild/console), and the url for the repo i'm releasing can be found [here](https://gitlab.com/jlack/rdl). Focusing on just the Ubunt 16.04 build farm failure for now, I see the following trace in the failed build console,
```
11:59:25 Identified the following build dependencies (ignoring packages available from source):
11:59:25   - catkin
11:59:25   - cppcheck
11:59:25   - cppcheck-junit-pip
11:59:25   - doxygen
11:59:25   - eigen
11:59:25   - graphviz
11:59:25   - roscpp
11:59:25   - roslib
11:59:25   - urdf
11:59:25 Resolved the dependencies to the following binary packages:
11:59:25   - cppcheck
11:59:25   - cppcheck-junit
11:59:25   - doxygen
11:59:25   - graphviz
11:59:25   - libeigen3-dev
11:59:25   - ros-kinetic-catkin
11:59:25   - ros-kinetic-roscpp
11:59:25   - ros-kinetic-roslib
11:59:25   - ros-kinetic-urdf
11:59:25 Traceback (most recent call last):
11:59:25   File "/usr/lib/python3/dist-packages/apt/cache.py", line 194, in __getitem__
11:59:25     return self._weakref[key]
11:59:25   File "/usr/lib/python3.5/weakref.py", line 131, in __getitem__
11:59:25     o = self.data[key]()
11:59:25 KeyError: 'cppcheck-junit'
11:59:25 
11:59:25 During handling of the above exception, another exception occurred:
11:59:25 
11:59:25 Traceback (most recent call last):
11:59:25   File "/usr/lib/python3/dist-packages/apt/cache.py", line 198, in __getitem__
11:59:25     rawpkg = self._cache[key]
11:59:25 KeyError: 'cppcheck-junit'
11:59:25 
11:59:25 During handling of the above exception, another exception occurred:
11:59:25 
11:59:25 Traceback (most recent call last):
11:59:25   File "/tmp/ros_buildfarm/scripts/devel/create_devel_task_generator.py", line 251, in <module>
11:59:25     main()
11:59:25   File "/tmp/ros_buildfarm/scripts/devel/create_devel_task_generator.py", line 116, in main
11:59:25     get_binary_package_versions(apt_cache, debian_pkg_names))
11:59:25   File "/tmp/ros_buildfarm/ros_buildfarm/common.py", line 144, in get_binary_package_versions
11:59:25     pkg = apt_cache[debian_pkg_name]
11:59:25   File "/usr/lib/python3/dist-packages/apt/cache.py", line 200, in __getitem__
11:59:25     raise KeyError('The cache has no package named %r' % key)
11:59:25 KeyError: "The cache has no package named 'cppcheck-junit'"
```
My package `rdl_cmake` has a build dependency on `cppcheck_junit` which is a pip package and I have called out that dependency in the `package.xml`. Also there is a key for `cppcheck-junit-pip` which is the key i'm using to call out the dependency, and a rosdep key for that is listed [here](https://github.com/ros/rosdistro/blob/master/rosdep/python.yaml), so i'm not sure where it's getting tripped up.





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