No such signal: SIGSIGRTMIN+5 at rt.pl line 5.

I can't get anything to work with the +5 stuff, but this code works:

#!/usr/bin/perl
use strict;
use warnings;

$SIG{'RTMIN'} = \&on_sig;

print $$, "\n";
while (1) {
    sleep 1;
    print ".\n";
}

sub on_sig {
    my $sig = shift;
    print "somebody told me $sig";
}
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When I send it a signal like this:

$ kill -s SIGRTMIN 763

I get:

somebody told me RTMIN.

-sam

(Wow, I've been gone too long. This was supposed to be a reply to the original question!)

I thought first 3 RT signals are conserved by something. I forgot where I seen that...