diff -ru a/cmake/OpenCVFindLibsPerf.cmake b/cmake/OpenCVFindLibsPerf.cmake
--- a/cmake/OpenCVFindLibsPerf.cmake	2019-04-06 16:43:23.000000000 -0500
+++ b/cmake/OpenCVFindLibsPerf.cmake	2021-11-26 18:35:50.606453927 -0600
@@ -62,9 +62,7 @@
     PKG_CHECK_MODULES(CLP clp)
     if(CLP_FOUND)
       set(HAVE_CLP TRUE)
-      if(NOT ${CLP_INCLUDE_DIRS} STREQUAL "")
-        ocv_include_directories(${CLP_INCLUDE_DIRS})
-      endif()
+      ocv_include_directories(${CLP_INCLUDE_DIRS})
       link_directories(${CLP_LIBRARY_DIRS})
       set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} ${CLP_LIBRARIES})
     endif()