This is the correct spelling, instead of capitalizing it.
* existing one in OpenBSD and Freedesktop's libbsd (the former having existed
* for over ten years). Despite this incompatibility being reported during
* development (see http://gnats.netbsd.org/44977) they still shipped it.
- * Even more unfortunately FreeBSD and later MacOS picked up this incompatible
+ * Even more unfortunately FreeBSD and later macOS picked up this incompatible
* implementation.
*
* Provide both implementations and default for now on the historical one to
http://gnats.netbsd.org/44977) they still shipped it.
Even more unfortunately
.Fx
-and later MacOS picked up this incompatible implementation.
+and later macOS picked up this incompatible implementation.
.Pp
Provide both implementations and default for now to the historical one to
avoid breakage, but we will switch to the
* existing one in OpenBSD and Freedesktop's libbsd (the former having existed
* for over ten years). Despite this incompatibility being reported during
* development (see http://gnats.netbsd.org/44977) they still shipped it.
- * Even more unfortunately FreeBSD and later MacOS picked up this incompatible
+ * Even more unfortunately FreeBSD and later macOS picked up this incompatible
* implementation.
*
* Provide both implementations and default for now on the historical one to
* existing one in OpenBSD and Freedesktop's libbsd (the former having existed
* for over ten years). Despite this incompatibility being reported during
* development (see http://gnats.netbsd.org/44977) they still shipped it.
- * Even more unfortunately FreeBSD and later MacOS picked up this incompatible
+ * Even more unfortunately FreeBSD and later macOS picked up this incompatible
* implementation.
*
* Provide both implementations and default for now on the historical one to