diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5480e242a..4b3045b0e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -302,16 +302,6 @@ endif()
 
 # Check for functions that may or may not exist.
 
-CHECK_FUNCTION_EXISTS( filelength FILELENGTH_EXISTS )
-if( FILELENGTH_EXISTS )
-	add_definitions( -DHAVE_FILELENGTH=1 )
-endif()
-
-CHECK_FUNCTION_EXISTS( strupr STRUPR_EXISTS )
-if( NOT STRUPR_EXISTS )
-	add_definitions( -DNEED_STRUPR=1 )
-endif()
-
 require_stricmp()
 require_strnicmp()