Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [Problem: cannot install the best candidate for the job]: [This is a general error message stating that the build system was unable to find and install the optimal package to fulfill a specific dependency.]
=============
[  - nothing provides nim-srpm-macros needed by redhat-rpm-config-178-1.fc34.noarch from copr_xxmitsu_llvm_priority_10
]: [This part specifies the exact dependency problem.
nim-srpm-macros: This is the package name that's missing.
redhat-rpm-config-178-1.fc34.noarch: This is the package that requires nim-srpm-macros.
copr_xxmitsu_llvm_priority_10: This is the repository from which the redhat-rpm-config package is being pulled.]

Issue: The RPM build failed because it couldn't find the required package nim-srpm-macros. This package is a dependency of redhat-rpm-config-178-1.fc34.noarch, which is being pulled from the copr_xxmitsu_llvm_priority_10 repository.
Resolution: Track down package nim-srpm-macros. Contact owner of the package and work with them on a resolution.