How to catkin_make_isolated a non-catkin package when CMakeLists.txt not in pkg root

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Hi,

We'd like to make our projects self-contained, so we are adding all possible (external) packages to our GIT repo as submodule, and build our project with catkin_make_isolated. This works with Ceres, Google Cartographer, etc., but does not seem to be working with some other module.

I added it as submodule, but the problem (apart from the missing package.xml, which I created) is that the CMakeLists.txt file is in a cmake/ directory, not in the package root. It looks like catkin_make_isolated fails to find the cmake/CMakeLists.txt file.

Moving or symlinking does not work, as the file uses other files in the cmake/ directory.

Is there a way to force catkin to look for CMakeLists.txt in cmake/?

Thanks.