Created attachment 466120 [details, diff] Add use flag to ebuild I am missing the ssl use flag, the build ./configure of upstream does provide the option. And with the provided patch it can be built. I don't know if there is another reason to not provide this use flag, in this case this bug should probably be closed immediately with an explanation. The version mentioned above is the oldest I could find, but it is likely that there are older versions that have the same problem.
Please correct me if I'm mistaken but FWICS openssl is used to provide hash functions on systems that do not provide them in libc (i.e. GNU/Linux). While I think that technically libarchive can be built without them, it would probably be severely crippled. At the same time, OpenSSL is a common enough library that there doesn't seem to be any gain from avoiding the dependency.