If you want to run Coccinella on a machine architecture not presently supported (MacOSX/Windows/Linux-x86/NetBSD) there are two extensions to Tcl/Tk itself which you need to build from their C sources. These are:
They are built the usual way using configure/make/make install but I'm unsure if you need to have Tcl/Tk sources available. This is under the assumption you are running Tcl/Tk 8.5 or later. This will be required before Coccinella version 0.96.10. Then you just get Coccinella sources and execute it from the console (./Coccinella.tcl).