3.14. Do I need to install the complete sources?

In general, no. However, we would strongly recommend that you install, at a minimum, the ``base'' source kit, which includes several of the files mentioned here, and the ``sys'' (kernel) source kit, which includes sources for the kernel. There is nothing in the system which requires the presence of the sources to operate, however, except for the kernel-configuration program config(8). With the exception of the kernel sources, our build structure is set up so that you can read-only mount the sources from elsewhere via NFS and still be able to make new binaries. (Because of the kernel-source restriction, we recommend that you not mount this on /usr/src directly, but rather in some other location with appropriate symbolic links to duplicate the top-level structure of the source tree.)

Having the sources on-line and knowing how to build a system with them will make it much easier for you to upgrade to future releases of FreeBSD.