I got the same error with the 2.5.11 installer on MacOS 10.13.5. It appears to me that the problem is that it's looking for libvorbis 1.3.5_1, but the installed version is 1.3.6. (At least, I have a directory at /usr/local/Cellar/libvorbis/1.3.6, but not 1.3.5_1.)