libdevel-autoflush-perl 0.06-1 (amd64 binary) in ubuntu yakkety

 Devel::Autoflush is a hack to set autoflush for STDOUT and STDERR from the
 command line or from "PERL5OPT" for code that needs it but doesn't have it.
 .
 This often happens when prompting:
 .
   # guess.pl
   print "Guess a number: ";
   $n = <STDIN>;
 .
 As long as the output is going to a terminal, the prompt is flushed when STDIN
 is read. However, if the output is being piped, the print statement will
 not automatically be flushed, no prompt will be seen and the program will
 silently appear to hang while waiting for input.