To me, the original korn shell would be be ksh88 not pdksh. Current
package description ...
The MirBSD Korn Shell, which contains many additions to the original
... gives the impression that mksh could be based on ksh88 (or, even on
ksh93). It is, however, based on pdksh.
Further, the web page (available at the URL given) expands "mksh" to
"MirBSD Korn Shell" not "MirOS korn Shell".
Following patch borrows the description from ...
Awaiting maintainers feedback
I'll take it.