Hi all I am working on a project that requiring some program scripts concerning with 1) Compute Amber Energy Function 2) Read rotamer information from the Dunbrack Backbone-dependent Rotamer library 3) Read in Electron Density Map and get the density value for each 3-D point in the crystal I did check some related python files in the source code folder and can understand them to some extent, but for running these files, some modules (e.g. Chimera, Rotamers) are needed. However, I don't know how to install these modules, or maybe I should recompile Chimera from source code first(If so, then how, because I don't know the procedure either. BTW, my platform is mac osx)? Could someone show me which files I should use for the above mentioned three subjects and what kinds of modules I should install and how? Yang