I've been scratching my head over how to deal with the version ID code that is supposed to apear as the first two lines of any FreeBSD source file:
#include <sys/cdefs.h> __FBSDID("$FreeBSD$");
Clearly, I cannot reasonably assume that all platforms define a __FBSDID macro in sys/cdefs.h.
Portability doesn't mean "the code wiil compile on every platform and C compiler in the world". Most platforms will have their own packaging systems and directory hierarchy, so *some* changes will have to be made every time code is ported; as long as the necessary changes are obvious, I don't see that there is any real problem.
Colin Percival
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