I think you'll need to use parse-command-line, instead of command-line. -J

On Sun, Jan 17, 2016 at 7:51 AM, Pieter Breed <pieter.br...@gmail.com>
wrote:

> Hi All,
>
> (I'm cross-posting this from StackOverflow)
> http://stackoverflow.com/q/34837318/24172
>
> I have this code:
>
> (define s1 "aoeu")
>
> (define command
>   (command-line
>    #:usage-help s1
>    #:args (op) op))
>
> It fails with "command-line: #:usage-help clause contains non-string."
>
> If I replace the reference to s1 with an actual string (eg "aoeu") then it
> works just fine. I would like to build up that string (s1 in this example)
> dynamically, but I can't figure out how to do that.
>
> P
>
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