from J.T. Conklin <conklin@kaleida.com>:

When the -mandoc macros encounter a .TH, it loads the old -man macros,
slices up a new .TH, and hands off.

But the .TH arguments are not quoted in the new .TH invokation.
Dates, section names, etc., are split up and scattered across the
headers and footers of the manpage.

Very ugly.

Fix:
The following patch to /usr/share/tmac/tmac.andoc quotes the arguments
before they are (re)interpreted by .TH.

share/tmac/tmac.andoc

@@ -50,6 +50,6 @@
 .de TH
 .rn TH xX
 .so /usr/share/tmac/tmac.an.old
-.TH \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8
+.TH "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7" "\\$8"
 .rm xX
 ..