Cannot install python3-check-manifest in fedora34 toolbox

I have a custom package, in copr, I am trying to build for fedora 34. I think I have tracked the problem to the following error and cause:

$ sudo dnf install python3-check-manifest
Last metadata expiration check: 0:38:29 ago on Sat Apr 10 00:32:48 2021.
 Problem: conflicting requests
  - nothing provides python3.9dist(build) >= 0.1 needed by python3-check-manifest-0.45-2.fc34.noarch
(try to add '--skip-broken' to skip uninstallable packages)

You can get/reproduce this error by creating a new fedora-34 toolbox container:

$ toolbox create --distro fedora --release f34
$ toolbox enter fedora-toolbox-34

Any ideas what is happening or how to address it?

I did some further digging. It appears that the check-manifest package now requires a new pypi package called build that is not packaged in fedora.

I was able to sidestep this by removing the need to install the package as a fedora package and installing it as a pip package instead.