If you have sun-os 4.1.2 with sun-4, you 
can get this binary to run. 
Please change the file recaller.sun-os.4.1.2 into
recaller and run for example,

% recaller ftp 
% recaller csh
% recaller sh
% recaller telnet ccsun44.csie.nctu.edu.tw 4040
% recaller dbx
% recaller nslookup


The source will be available soon.
Mail any comments to
skhuang@csie.nctu.edu.tw