I have finally managed to compile the latest (default) version of Sunrise! I had to tinker with it periodically over the course of a few days, but I finally managed to do it.  The current version of the code in the Mercurial repository has evidently been designed to compile only with Arepo support, but I do not have Arepo and I will not be using Arepo for my project.  It seems that compiling the code without Arepo is planned, but not fully implemented in the current version.  There are several errors that occur when Arepo is absent.  In order to get the code to compile, I had to extensively edit the pre-processor directives.