From perldoc -f fcntl: 
Note that "fcntl" will produce a fatal error if used on a
machine that doesn’t implement fcntl(2).  See the Fcntl 
module or your fcntl(2) manpage to learn what functions 
are available on your system.

Recent versions of Perl directly translate your systems' fcntl.h file and define what it defines. My fcntl.h file includes bits/fcntl.h to get the definitions of O_*, FD_* and F_*, including F_GETFL and F_SETFL. My perl intallation recognized this and defined them for me in Fcntl.pm.

What OS are you running?

-- dug

In reply to Re: problem with fcntl by dug
in thread problem with fcntl by nivlek78

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