install the additional package

Hi, Dear all,

i have now problem while installing a monitoring software (Open Monitoring Distribution) on RedHat 7.2 enterprise.
i got error messages that the following packages are needed:
fping, graphviz-gd, libmcrypt, perl-Net-SNMP, php-mbstring, xorg-x11-server-Xvfb, freeradius-utils.
I tried to use yum and such packages are not availale.

My first question:
Are there any reliable rpm quelle so that i can download them? Or can i just add some repos in Yum configuration?

My second question:
i tried to install the fping from source code through multiple steps (./configure, Make, Make install). I found that the fping is installed under /usr/local/sbin.
After that i found the monitoring software can not found that fpring is arelday installed. What can i possilbly do?

Best Regards