I've been dealing with some reports about internal library functions not being stable... That is folk calling into the library to do things not supported by the official API. I think it would be good to figure out what functions are callable like this and stop exporting them. This sort of thing showed up in: https://bugs.debian.org/869588 https://stackoverflow.com/questions/22244428/hiding-symbol-names-in-library offers some suggestions for how to do this.
Fixed with: https://git.kernel.org/pub/scm/libs/libcap/libcap.git/commit/?id=329b69ea640960d7afffc1c780ed4dde13549292