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rrdtool version 1.7.2 needs to be installed. The following steps are just an example.  These worked in the Opmantek servers, but the commands may not be the same for various versions of Linux.

Step #1 - cat /etc/os-release

Step #2 - Download rrdtool version 1.7.2 from here:
https://oss.oetiker.ch/rrdtool/pub/rrdtool-1.7.2.tar.gz

http://archive.ubuntu.com/ubuntu/pool/main/r/rrdtool/rrdtool_1.7.2.orig.tar.gz 

Step #2#3 - Remove old rrdtool

apt-get purge rrdtool

or

yum remove rrdtool

Step #3#4 - Compile and install rrdtool 1.7.2

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tar -zxvf rrdtool-1.7.2.tar.gz 
 
cd rrdtool-1.7.2
 
### Configure
./configure --enable-shared --prefix=/usr/local/rrdtool
 
### Compile (just from the prompt)
make
 
### Install
sudo make install

Step #4#5 - Verification 

root@deb8:~/rrdtool-1.7.2# /path/to/rrdtool/bin/rrdtool --version
RRDtool 1.7.2 Copyright by Tobias Oetiker <tobi@oetiker.ch>
Compiled Mar 18 2021 14:29:00

Step #5#6 - Point NMIS at new rrdtoolInstall the attached uselib.pm in /usr/local/nmis8/lib/NMIS

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