From mds@ecn.purdue.edu

Consider the following perl program​:
  use Fcntl;
  use Fcntl qw(​:DEFAULT :flock);
  print "F_RDLCK is " . F_RDLCK . "\n";
  print "F_SETLK is " . F_SETLK . "\n";

Running it on our perl, version 5.005_01 built for sun4-solaris-thread gives​:
  F_RDLCK is 1
  F_SETLK is 6

Running it on our perl, version 5.005_54 built for sun4-solaris-thread gives​:
  F_RDLCK is 1
  Can't locate auto/Fcntl/F_SETLK.al in @​INC (@​INC contains​: /usr/local/lib/perl/5.00554/sun4-solaris-thread /usr/local/lib/perl/5.00554 /usr/local/lib/perl/site_perl/5.00554/sun4-solaris-thread /usr/local/lib/perl/site_perl/5.00554 .) at o.pl line 4

Mark