--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -451,6 +451,7 @@ ENDIF()
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
 include(CheckCSourceCompiles)
+include(CheckSymbolExists)
 include(TestBigEndian)
 
 check_include_files(strings.h HAVE_STRINGS_H)
