high bit set) and the character set is not specified as above, then
.B mhbuild
will assume the character set is of the type given by the
-environment variable MM_CHARSET. If this environment variable is not
+standard
+.IR locale (1)
+environment variables. If these environment variables are not
set, then the character set will be labeled as \*(lqx-unknown\*(rq.
.PP
If a text content contains only 7\-bit characters and the character set