Description of problem: The version currently in EL7 lacks support for things like argon2, updating to a newer version (e.g. 1.0.11) will introduce a few more things. Rebuilding the F25 SRPM on EL7 works fine. Reading the release notes, everything should be backwards compatible: https://github.com/jedisct1/libsodium/releases
But will break the API/ABI which is against update policy. http://rpms.remirepo.net/compat_reports/libsodium/
1.0.6 => 3 removed symbols 1.0.7 => 10 removed symbols
If someone want to provide nother package, which can be installed beside default version (e.g. libsodum18), fine for me BTW, this is what I do in "remi" repository with the libsodium-last package.