+# Define USE_ASCIIDOCTOR_MANPAGE to use Asciidoctor's manual page backend
+# instead of building manual pages from DocBook (using xmlto). Has no effect
+# unless USE_ASCIIDOCTOR is set.
+#
Why not just USE_ASCIIDOCTOR_MANPAGE implies USE_ASCIIDOCTOR?
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An old man doll... just what I always wanted! - Clara