pkgconfig-paths.patch

--- opencv-4.5.1/cmake/OpenCVGenPkgconfig.cmake~	2020-12-21 21:01:38.000000000 +0100
+++ opencv-4.5.1/cmake/OpenCVGenPkgconfig.cmake	2021-03-07 10:47:09.068714587 +0100
@@ -124,14 +124,14 @@
 ocv_list_unique(_3rdparty)
 
 set(OPENCV_PC_LIBS
-  "-L\${exec_prefix}/${OPENCV_LIB_INSTALL_PATH}"
+  "-L${OPENCV_LIB_INSTALL_PATH}"
   "${_modules}"
 )
 if(BUILD_SHARED_LIBS)
   set(OPENCV_PC_LIBS_PRIVATE "${_extra}")
 else()
   set(OPENCV_PC_LIBS_PRIVATE
-    "-L\${exec_prefix}/${OPENCV_3P_LIB_INSTALL_PATH}"
+    "-L${OPENCV_3P_LIB_INSTALL_PATH}"
     "${_3rdparty}"
     "${_extra}"
   )
@@ -142,8 +142,8 @@
 #generate the .pc file
 set(prefix      "${CMAKE_INSTALL_PREFIX}")
 set(exec_prefix "\${prefix}")
-set(libdir      "\${exec_prefix}/${OPENCV_LIB_INSTALL_PATH}")
-set(includedir  "\${prefix}/${OPENCV_INCLUDE_INSTALL_PATH}")
+set(libdir      "${OPENCV_LIB_INSTALL_PATH}")
+set(includedir  "${OPENCV_INCLUDE_INSTALL_PATH}")
 
 configure_file("${OpenCV_SOURCE_DIR}/cmake/templates/opencv-XXX.pc.in"
                "${CMAKE_BINARY_DIR}/unix-install/${OPENCV_PC_FILE_NAME}"