[Groff] Accents in output

[MJ Ray]

This is an old chestnut, but I can't figure the answer out from the list 
archives.

How do I get accented characters in my output?

I'm particularly interested in c, g, h, j and s with circumflex (ĉĝĥĵŝ), and u 
with breve (ŭ). I understand that I can't enter UTF-8 at present, but neither 
\(c^ or \[^c] works for me. For that matter, nor does \[^a].

Just in case it matters, I'm variously using ms, mandoc and mom macros, but 
this looks like a basic groff matter.

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