catdoc.1 mentions non-existent "catdoc library directory" /usr/lib64/catdoc

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catdoc.1 mentions a "catdoc library directory" several times:

Charset file has format described in CHARACTER SETS below and should have .txt extension and reside in catdoc library directory ( /usr/lib64/catdoc). ...
[Character sets] are stored in plain text files in catdoc library directory ...
These lists [of character substitutions] are stored in catdoc library directory ...
its system-wide configuration file ( catdocrc in catdoc library directory)

But there is no /usr/lib64/catdoc. catdoc's charset .txt files and substitution .specchars files (and replacement .replchars files) are all stored in catdoc's data directory, /usr/share/catdoc on most Linux systems. And it looks for its system-wide configuration file in the usual system configuration directory (/etc on most Linux systems), not in a catdoc-specific directory.

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Changing catdoc.1.in to @datadir@/catdoc doesn't work; GNU Autoconf's documentation of Installation Directory Variables indicates this is intentional:

It is deliberate that the directory output variables keep them unexpanded: typically @datarootdir@ is replaced by ‘${prefix}/share’, not ‘/usr/local/share’, and @datadir@ is replaced by ‘${datarootdir}’. ...
A corollary is that you should not use these variables except in makefiles; instead, let make manage their replacement.

and gives an example of a Makefile.in rule to perform the substitution.