Hi,
I keep forgetting this myself, and it might also be interesting for others: if you try EOS_Omni currently and want to use simfactory, this is how you can do this with one command (point to your thornlist, including EOS_Omni and _not_ including the other EOS thorns):
./simfactory/sim build --thornlist=../thornlists/Omni.th --attach=FPPFLAGS=-DUSE_EOS_OMNI=1 --attach=CPPFLAGS=-DUSE_EOS_OMNI=1
Frank