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:

  [./client.go:382:31: non-constant format string in call to (*github.com/emersion/go-smtp.Client).cmd
./client.go:411:31: non-constant format string in call to (*github.com/emersion/go-smtp.Client).cmd
FAIL	github.com/emersion/go-smtp [build failed]
error: Bad exit status from /var/tmp/rpm-tmp.qQ7D5A (%check)
    Bad exit status from /var/tmp/rpm-tmp.qQ7D5A (%check)]: [It marks the build failure information and describes the issue.]

Issue: Go wants non-constant format strings to be explicitly handled
Resolution: Most likely convert the string.