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require threads ;
require threads::shared ;
...
require Thread::Semaphore;
require Getopt::Std;
require Carp;

PerlThreads]# perlcc -o xm xm.pl
/usr/bin/perlcc: xm.pl did not compile:
...
 String found where operator expected at xm.pl line 151, near "carp "p
+roblem with the NamedPipe ($opt_n) ""
        (Do you need to predeclare carp?)
....