I made a first attempt to also build the shared library of the package. You can find an updated source package on the mentors site: https://mentors.debian.net/package/unrar-nonfree
The changes needed is an updated debian/rules file and a patch in makefile.unix from upstream. I didn't split the package into two (library/binary), if this is needed please let me know. I attach the debdiff between the previous and the new version Hope this issue is resolved so that we can finally have CBR support in calibre. -- =Do- N.AND
debdiff_4.1.4-1_4.1.4-1+andrik1.patch
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