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#if __FreeBSD__ == 0 /* 1.0 did not define __FreeBSD__ */
#define __FreeBSD_version 199401
#elif __FreeBSD__ == 1 /* 1.1 defined it to be 1 */
#define __FreeBSD_version 199405
#else /* 2.0 and higher define it to be 2 */
#include <osreldate.h> /* and this works */
#endif
int main(void) {
extern int getosreldate(void);
printf("Compilation release date: %d\n", __FreeBSD_version);
#if __FreeBSD_version >= 199408
printf("Execution environment release date: %d\n", getosreldate());
#else
printf("Execution environment release date: can't tell\n");
#endif
}
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