--- a/cmake/templates/opencv-XXX.pc.in	2019-12-04 21:28:09.686525699 +0100
+++ b/cmake/templates/opencv-XXX.pc.in	2019-12-04 21:29:21.319265154 +0100
@@ -3,7 +3,7 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
-includedir_old=@includedir@/opencv
+includedir_old=@includedir@/opencv2
 includedir_new=@includedir@
 
 Name: OpenCV