Type echo $PATH in Terminal to make certain that /opt/local/bin/ is included. 
If not then you need to add it or just use: 

sudo /opt/local/bin/port install cairo.

-Al-

On Wed, Oct 18, 2017 at 02:25 AM, John wrote:
> Hi, 
> 
>    I tried to install Cairo graphics 
> 
> https://www.cairographics.org/download/ 
> <https://www.cairographics.org/download/>
> 
>    and I need to install Macports. 
> 
>    I tried to install Macports on my Mac OS Sierra 10.12.6, and type "sudo 
> port install cairo", but it did not respond. I haven't seen any file name or 
> app called Macports, but one file called "port" which is located at
> 
> loca/bin/port"
> 
>    How should I do it? 
> 
>    Thanks,
> 
> John

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