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