[plt-scheme] knowing if dynamic-require will succeed

At Sat, 5 Sep 2009 11:54:31 -0400, Lee Spector wrote:
> So what I would ideally like to do is to replace (equal? 'unix (system- 
> type)) with something that asks what I really need to know, which is  
> "Will dynamically requiring plot fail?"
> 
> Is there a way to do this?

I think you want `gui-avilable?' from `scheme/gui/dynamic'.