$ mandoc -Tlint /usr/src/share/man/man4/udl.4 /usr/src/share/man/man4/udl.4:42:6: ERROR: skipping bad character: ignoring byte
The o with diaeresis should be replaced with the \(:o escape. (See mandoc_char(7).) Would send a patch, but I've never had luck sending high-bit files to the list. -- Anthony J. Bentley