Cannot build on ubuntu-20.04 - failed to select a version for the requirement `crypto-mac = "^0.5"`

[plasmapower]

Cannot build on ubuntu-20.04 - failed to select a version for the requirement `crypto-mac = "^0.5"`

[PlasmaPower]

Should be fixed, let me know if it isn't and I'll reopen

It looks like they have yanked crypto-mac 0.5 which blake2 0.7 relies on.

Changing blake2 to a more modern version doesn't work though unfortunately as the functions have changed. This affects deriviation.rs. I also don't have enough rust experience to fix this, but perhaps this debugging info will make things quicker for @PlasmaPower

[PlasmaPower]

Given that cogciprocate/ocl#203 still exists, I'm not certain how maintainable this project is anyways, but I'll go ahead and fix it as I have experience upgrading digest versions

[tdiazcu]

Hi PlasmaPower, still fails... in Ubuntu 20.04 can not build... paste error here:

error: failed to select a version for the requirement crypto-mac = "^0.7.0"
candidate versions found which didn't match: 0.11.1, 0.11.0, 0.10.1, ...
location searched: crates.io index
required by package blake3 v0.2.1
... which is depended on by pkgar v0.1.6 (~/redox-os/cookbook/pkgar)