They should match the library, and not get messed up by whatever the kernel-du-jour happens to be. - You can also upgrade between 4.x releases by patching. Patches are distributed in the xz format. To install by patching, get all the newer patch files, enter the top level directory ...
One last thing: finding the door to the main library requires a GPS and a bit of imagination and fortitude. Seriously. I knew I needed to lower my expectations here based on past experiences, but woefully underestimated just how low I'd have to go. A colleague here keeps telling me that...
This area has a (usually incomplete) set of kernel headers that are used by the library header files. They should match the library, and not get messed up by whatever the kernel-du-jour happens to be. - You can also upgrade between 4.x releases by patching. Patches are distributed in ...