"could not find RRDs.pm" occurs when you execute mrtg command

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Issue

RRDs.pm module is not found when you execute mrtg command.

# env LANG=C /usr/bin/mrtg mrtg.cfg
ERROR: could not find RRDs.pm. Use LibAdd: in mrtg.cfg to help mrtg find RRDs.pm

Environment

Red Hat Enterprise Linux (RHEL) 6

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