Software error:

Can't locate GD.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at nx-counter.pl line 3.
BEGIN failed--compilation aborted at nx-counter.pl line 3.

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