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Okay, this one is on me. Until recently, in my build environment, just after I ran rosdep against the package.xmls in my source space and just before I ran $ catkin config --install && catkin build, I did a # apt purge --yes sudo. This ~is~ was fine, so long as sudo was never an (eventual) build-time dependency. On 2019.10.26, that all changed and, for the first time, removing sudo from the set of installed packages caused ros-cmake-modules to be removed along with it. I've since stopped twiddling packages between the invocation of rosdep and the build proper.