Installing Delphes gives bizarre error?

I am trying to reinstall Delphes on our cluster, and I am getting a bizarre error. I talked to the guys at Delphes, who walked me through installing stand-alone Delphes and that worked fine. So I don't think that the issue is with Delphes itself.

I have the latest MG5_aMC install file and can and have installed pythia fine. But when I try to install Delphes, I get the following:

MG5_aMC>install Delphes
Command "install Delphes" interrupted with error:
InvalidCmd : The environment variable ROOTSYS is not configured.
 You can set it by adding the following lines in your .bashrc [.bash_profile for mac]:
 export ROOTSYS=/home/tmartin/root
 export PATH=$PATH:$ROOTSYS/bin
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib
 export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$ROOTSYS/lib
 This will take effect only in a NEW terminal

Of note, I have ROOT installed, and I can run ROOT just fine. Here is the result of echoing these paths:

[tmartin@cougar Delphes]$ echo $ROOTSYS
/home/tmartin/root
[tmartin@cougar Delphes]$ echo $PATH
/home/tmartin/root/bin:/home/tmartin/python/:/usr/lib64/qt-3.3/bin:/usr/kerberos/bin:/opt/intel/Compiler/11.1/064/bin/intel64:/usr/local/bin:/bin:/usr/bin:/usr/share/pvm3/lib:/home/tmartin/bin
[tmartin@cougar Delphes]$ echo $LD_LIBRARY_PATH
/home/tmartin/root/lib:/opt/intel/Compiler/11.1/064/lib/intel64

Clearly these variables are set correctly. And as I said at the start, I can install Delphes stand-alone just fine. (This is my ticket with them: https://cp3.irmp.ucl.ac.be/projects/delphes/ticket/263#comment:1)