X needed. What is this?

[markd at macports.org]

olivier SAINT-EVE <oliviersainteve at wanadoo.fr> on Wednesday, July 18, 2007
at 8:08 AM -0800 wrote:
>Hello, when I try to install cairo, I have the following error message:
>
>checking for X_CFLAGS...
>checking for X_LIBS...
>checking for X... no
>configure: error: X is required, but it was either disabled or not found.
>
>After a re-installation, it's the first port I install.
>Do you know what is X, and where find it?
>
>thank you,

It sounds like you haven't installed X11.  See section 2.2 here: 
http://homepage.mac.com/duling/macports/guide.html

Mark