--- CMakeLists.txt.orig	2021-05-13 19:09:42 UTC
+++ CMakeLists.txt
@@ -56,7 +56,6 @@ set(BUILD_SHARED_LIBS ${OIS_BUILD_SHARED_LIBS})
 if (UNIX AND NOT APPLE)
 
     find_package(X11 REQUIRED)
-    include_directories(SYSTEM ${X11_INCLUDE_DIR})
 
     set(ois_source
         ${ois_source}
@@ -188,8 +187,7 @@ endif()
 if(UNIX)
 
     if (NOT APPLE)
-        add_dependencies(OIS X11)
-        target_link_libraries(OIS X11)
+        target_link_libraries(OIS X11::X11)
     endif()
 
     set_target_properties(OIS PROPERTIES