hi, I'm still a newbie on mac osX and currently working on project with gumstix which runs on Linux. (mostly on the command prompt) However, i tried to run it on my mac OS X instead on installing Ubuntu because i thought linux and mac run on the same UNIX ? so, i tried to follow these setup steps shown below: http://www.gumstix.net/Software/view/Getting-started/Setting-up-a-build-environment/111.html i'm currently stuck at the point on source code caching: First we create a new group called oe and add your login account to the oe group. In the second command be sure to substitute your login user name where your_username is indicated. $ sudo groupadd oe $ sudo usermod -a -G oe your_username I can't get the sudo groupadd oe command working. I get these following error: Macintosh-2:gumstix christine-$ sudo groupadd oe sudo: groupadd: command not found can anyone help me to solve this problem ? I want to follow the setup steps properly, but this just seems getting nowhere for me. thanks.