Change texi2pdf call to include local TeX configuration file which increases save_history variable. The current pdf documentation cannot be built unless the save_size variable is increased from its value of 5000. On UNIX systems, not all users will have local root and the ability to change the default. I work around this by defining a local configuration file to use in addition to the system-wide texmf.cnf file.

% Increase save size to run @seealso macro for Octave documentation
save_size = 10000