One should be able to obtain informations with pkg-config. ie. wiith cairo 
installed it works fine
pkg-config --cflags cairo
pkg-config --libs cairo
But not with opencv4.

Joël 

> Le 9 févr. 2021 à 12:10, Marius Schamschula <[email protected]> a écrit :
> 
> I haven’t had time to look into that. I’m not the maintain of opencv4. For 
> the moment I downgraded opencv to version 3.4.13.
> 
>> On Feb 9, 2021, at 2:28 AM, Joël Brogniart <[email protected]> 
>> wrote:
>> 
>> I'm trying to adapt a portfile for a Linux application to depend on opencv4 
>> instead of opencv. The building of the application use pkg-config to find 
>> directory, library et compiler settings for different tools (opencv, 
>> cairo…). This works correctly except for opencv.
>> 
>> On Macports, the opencv4 port doesn't populate pkg-config data with its own 
>> information. Is there an explanation for the missing data?
> 
> Marius
> --
> Marius Schamschula

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