7.1.3 Kernel headers
Most "normal" programs don't need kernel headers and in fact may
break if you use them directly; instead they should be compiled against the
headers with which glibc was built, which are the
versions in /usr/include/linux and /usr/include/asm
of the Debian system.
So do not put symlinks to the directories in /usr/src/linux from
/usr/include/linux and /usr/include/asm, as suggested
by some outdated documents.
If you need particular kernel headers for some kernel-specific
application programs, alter the makefile(s) so that their include path points
to dir-of-particular-kernel-headers/include/linux and
dir-of-particular-kernel-headers/include/asm.
