Happens on OpenBSD and Linux (similar error message):
*** Installing manpages
usage: tr [-cs] string1 string2
tr [-c] -d string1
tr [-c] -s string1
tr [-c] -ds string1 string2
Seems [A-Z] etc needs to be quoted, e.g.,
tr '[a-z]' '[A-Z]'
There are several places like this in the Makefile.