Hi Chris, I also just noticed that you have NO_AQSIS defined for your compile. In order for those #defines to be present, NO_AQSIS should not be defined. > g++ -c -DUSE_SUMO_SOLID -pipe -fPIC -DNDEBUG -O2 -DMOZ_NOT_NET > -I../Physics/common -I../Physics/Dummy -DNO_AQSIS -DNO_AQSIS Jonathan Merritt.