[cairo] Making configure error message more clear

[Carl Worth]

On Thu, 18 Mar 2010 21:15:33 +0100, Arjen Nienhuis <a.g.nienhuis at gmail.com> wrote:
> > Below is an exchange I recently had with a new user trying to use cairo
> > who got this error and followed its advice, (browsed to the URL, found
> > pixman, downloaded it, installed it to the default /usr/local/). But the
> > user still got the same message, and never knew to adjust the
> > PKG_CONFIG_PATH environment variable.
> 
> Why isn't PKG_CONFIG_PATH set to $PREFIX/lib/pkgconfig by default?

I've often wondered why pkg-config doesn't do that by default.

But I suppose that we could just have cairo's configure script set that
environment variable that way if it's not already set. That would be a
nice solution for this problem.

-Carl

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