System information (version)

• OpenCV => 4.0.0-rc
• Operating System / Platform => Ubuntu 18.10
• Compiler => gcc 8.2.0 / gcc 6

Detailed description

I did cmake ...Then make and then make install
and it does not generate opencv.pc file.

If I use same commands for version 3.4.3 then the file is created.

Another thing
if I link with pkgconfig then it links to librarys with no version numbers.
so installing 4.0.0-rc after 3.4.3 makes pkgconfig unusable.
it would be nice if there were multiple opencv.pc files like opencv3.4.pc opencv4.pc