Another gotcha with GD fonts, is that it is easier to just copy the desired font to your working directory, to get the path right. Here is a simple example. Your GD must be compiled with FreeType IIRC, to enable ttf font support. But then, you can import any ttf font you like.
#!/usr/bin/perl
use GD;
use strict;
use warnings;
my ($w, $h) = (200, 200);
my $img = GD::Image->new($w, $h);
my $white = $img->colorAllocate(255,255,255);
my $black = $img->colorAllocate(0,0,0);
# this line causes a premature exit with "success".
#my $monaco = GD::Font->load('Generic.ttf');# or die "Can't load monac
+o!";
$img->rectangle(10,10,20,20,$black);
# Generic.ttf is in script's working directory
$img->stringFT($black,"./Generic.ttf",72,0,100,100,'A');
open (IMG, ">$0.png");
print IMG $img->png;
close IMG;
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