pkg-config and opencv4

[Joël Brogniart]

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?