If you've read FAQ 15 carefully, you'll note that there is absolutely no reason to build gnome from ports. FAQ 15.4.6 discusses this in some detail. Ports are only needed if packages do not already exist, and they won't exist for a -release system only if there are licensing restrictions or you need a unique FLAVOR of an application.
Installing from packages would eliminate your problem.
As to the cause of the problem itself -- it appears that there is a mismatch between the libcaca tarball, created in 2005, and the checksums in ports/graphics/libcaca/distinfo. Some possibilities exist, including data corruption of the tarball, or perhaps corruption of the distinfo file. Odds are on the former.
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