FreeBSD Port: automake-1.9.6_2

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How to fix this?

'`;  fi;  rm -rf $backupdir; exit $rc
./automake-1.9.texi:9821: Unknown command `headitem'.
makeinfo: Removing output file `./automake-1.9.info' due to errors; use 
--force to preserve.
*** Error code 1

Stop in /usr/ports/devel/automake19/work/automake-1.9.6/doc.
*** Error code 1

Stop in /usr/ports/devel/automake19/work/automake-1.9.6.
*** Error code 1

Stop in /usr/ports/devel/automake19.
guice#