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If you experience any problems with XSane and sane-backends with a version number greater than 1.0.19 then this may be caused by an incompatible development of sane-backends. In this case it may be worth to try sane-backends-1.0.19 or earlier. XSane is and will keep compatible to the original SANE-1.0 standard. I will not spend any time for incompatible things that will mess up everything. When the SANE-1.1 changes are compatible to SANE-1 then there is no need to change anything in XSane.
brew install xsane