This is very out of date. As of version 4.2.2., the neuron compilation procedure has been completely redone. There are some substantial differences from older versions of neuron, so please read the beginning of the INSTALL file before you try to build it. Some examples of neuron .hoc and .mod files are contained in the examples subdirectory of the distribution. These files are not installed since they aren't at all important for running neuron, but you may want to look through them.