I'm trying to install the AMD catalyst kernel drivers on my updated Sabayon with kernel 3.7.
It fails with "fglrx installation requires that the system have kernel headers. /lib/modules/3.7.0-sabayon/build/include/linux/version.h cannot be found on this system."
I have the directory and it contains a lot of files, except version.h.
I found that I have /lib/modules/3.6.0-sabayon/build/ (as well as 3.4.0, 3.3.0 ) contains version.h (and only that file in include-directory) and have a different structure than for 3.7.0. I cannot recall that I have done something different when upgrading the kernel (using kernel-switcher).
What do I need to do to have version.h?

