Instead of using a CPAN module why not try simply creating a file and then call gnuplot (see the gnuplot demo gallery)..
Some tested example code: use strict;
open( my $fout, ">myplot.gpt" )
or die( "Problem: $!" );
print( $fout <<'EOF' );
reset
set terminal png size 320,160 medium
set output 'myplot.png'
set title "Test Plot"
set xrange [0:5]
set yrange [0:100]
plot [0:5] "-" using 1:2 title "Distance" with lines
1.0 20
2.0 40
3.0 40
4.0 80
end
EOF
close( $fout );
my $result = `gnuplot myplot.gpt`;
print( $result ) if ( $result );
Update: added close() to ensure command file was closed before being fed to gnuplot | 