I only see S_IFLNK defined in <sys/stat.h>, is the mismatch here intentional?

https://pubs.opengroup.org/onlinepubs/7908799/xsh/sysstat.h.html

I do see some other references to S_IFLINK elsewhere:

https://www.google.com/search?q=%22S_IFLINK%22&rlz=1CACZQS_enUS1153US1153&oq=%22S_IFLINK%22&gs_lcrp=EgZjaHJvbWUqBggAEEUYOzIGCAAQRRg7MgoIARAAGIAEGKIEMgcIAhAAGO8FMgoIAxAAGIAEGKIEMgoIBBAAGKIEGIkFMgcIBRAAGO8F0gEINDAxOGowajSoAgCwAgA&sourceid=chrome&ie=UTF-8

So maybe it's indeed intentional.