Dear Bruce, I try to instal Demeter on a Mac running El Capitan. I carefully followed the procedure (installation of Xcode and Macports), and I type the command: sudo port install xorg-server demeter in a terminal window. Unfortunately, after about 30 seconds, I am stuck with the following message: ---> Computing dependencies for xorg-server Would you have any suggestion? With my best regards, Manuel -- Manuel Muñoz Institut des Sciences de la Terre Université Joseph Fourier 1381 rue de la piscine – BP53 38041 Grenoble cedex 9 – France Tel.: 33 (0)4 76 51 40 54 – Fax: 33 (0)4 76 63 52 52