Index: cv_bridge/CMakeLists.txt
===================================================================
--- cv_bridge.orig/CMakeLists.txt
+++ cv_bridge/CMakeLists.txt
@@ -17,14 +17,7 @@ else()
 find_package(Boost REQUIRED)
 endif()
 
-set(_opencv_version 4)
-find_package(OpenCV 4 QUIET)
-if(NOT OpenCV_FOUND)
-  message(STATUS "Did not find OpenCV 4, trying OpenCV 3")
-  set(_opencv_version 3)
-endif()
-
-find_package(OpenCV ${_opencv_version4} REQUIRED
+find_package(OpenCV 4 REQUIRED
   COMPONENTS
     opencv_core
     opencv_imgproc