GD-png error

[Ramprasad A Padmanabhan]

I finally got GD installed on my machine , linux redhat 7.2 and perl 5.8.0
with libgd.so.2.0.12
I tried to write a simple GD script copied from the perldoc I get this error

gd-png:  fatal libpng error: zlib error
gd-png error: setjmp returns error condition
PNG
This does not seem to be a perl error , any ideas

Thanks
Ram
This is my script ( straight from perldoc GD )

#!/usr/bin/perl
use GD;
# create a new image
$im = new GD::Image(100,100);
# allocate some colors
$white = $im->colorAllocate(255,255,255);
$black = $im->colorAllocate(0,0,0);
$red = $im->colorAllocate(255,0,0);
$blue = $im->colorAllocate(0,0,255);
# make the background transparent and interlaced
$im->transparent($white);
$im->interlaced('true');
# Put a black frame around the picture
$im->rectangle(0,0,99,99,$black);
# Draw a blue oval
$im->arc(50,50,95,75,0,360,$blue);
# And fill it with red
$im->fill(50,50,$red);
# make sure we are writing to a binary stream
binmode STDOUT;
# Convert the image to PNG and print it on standard output
print $im->png;
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