[cairo] Better error messages for missing backends

[Carl Worth]

On Thu, 12 May 2005 22:55:04 -0700, Carl Worth wrote:
> On Thu, 12 May 2005 22:28:21 -0700, Carl Worth wrote:
> > I've attached a patch that implements this and I will commit it unless
> > I hear of a better suggestion or improvements.
> 
> In testing this patch, I found that it's not entirely
> effective.

I've gone ahead and committed it as is, since I don't think it makes
anything worse.

> We could change things to get consistent behavior. We could get (2)
> always (which has a slightly more helpful message) by unconditionally
> installing all headers. But installing cairo-win32.h and
> cairo-quartz.h on Unix-like systems (for example) would be less than
> elegant. And we could get (1) always by removing all old headers as
> part of "make install".

And we can still do one of those if it ever seems important.

-Carl
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