Package control_msgs was not found in the pkg-config search path

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I am trying to install the dynamixel_controllers package in Groovy on a 12.04 system. When 'rosmake'-ing the dynamixel nodes... I receive this error:

Failed to invoke /opt/ros/groovy/bin/rospack cflags-only-I;--deps-only dynamixel_controllers Package control_msgs was not found in the pkg-config search path. Perhaps you should add the directory containing 'control_msgs.pc' to the PKG_CONFIG_PATH environment variable No package 'control_msgs' found

Now, I have built the 'control_msgs' package and can roscd to "control_msgs". When looking at the pkg-config folder in /opt/ros/groovy/lib/pkgconfig" folder, I do not see a 'control_msgs.pc' file, like I believe I should. Should there be one there? If not, why wouldn't it have been built if in fact the 'control_msgs' package was made like it says it was...?

Any help is appreciated.