git doc build failure on OS X 10.5.6 (Leopard) during xmlto phase

Hello,

On OS X 10.5.6 (Leopard), the command ...

   xmlto -m callouts.xsl man git-filter-branch.xml

... terminates with these errors:

xmlto: input does not validate (status 1)
/git-1.6.2/Documentation/git-filter-branch.xml:431: parser error :
PCDATA invalid Char value 7
Clone it with <literal>git clone +++0+++</literal>.  The clone
                                    ^
/git-1.6.2/Documentation/git-filter-branch.xml:431: parser error :
PCDATA invalid Char value 7
Clone it with <literal>git clone +++0+++</literal>.  The clone
                                      ^
make[1]: *** [git-filter-branch.1] Error 1
make: *** [doc] Error 2

What issue-tracker, if any, would be appropriate for this?

-- Tom Holaday