I don't know Pandora, so a few words about GraphViz only :
Easy to set up to --prefix=/home/"user"/GraphViz
and then link GraphViz/bin/* to /home/"user"/bin/.
I got the source code here
http://www.graphviz.org/Download.php > .. Agree .. >
http://www.graphviz.org/Download..php
http://www.graphviz.org/Download_linux_rhel.php
> > graphviz-2.22.2-1.src.rpm
gv_php ? Says no to my 'php6-devel' and yes to all other
availabe ' -devel ' files.
.....
But the alternative could be : Find an '.rpm' for your
OS, unpack it ( rpm2cpio <package> | cpio -idmv ) and
copy the binaries to/home/"user"/bin/ .
'/home/"user"/bin/' may already be in your path.
.....