--- configure.in
+++ configure.in
@@ -4170,7 +4170,7 @@ AC_ARG_WITH(mantype,
 			[AC_MSG_ERROR(invalid man type: $withval)])
 		])
 if test -z "$MANTYPE"; then
-	AC_PATH_PROGS(NROFF, nroff awf, /bin/false, "/usr/bin:/usr/ucb")
+	AC_PATH_PROGS(NROFF, nroff mandoc awf, /bin/false, "/usr/bin:/usr/ucb")
 	if ${NROFF} -mdoc ${srcdir}/man/ruby.1 >/dev/null 2>&1; then
 		MANTYPE=doc
 	else