diff --git a/awesomeConfig.cmake b/awesomeConfig.cmake
index 0bf2ad469..659d019ab 100644
--- a/awesomeConfig.cmake
+++ b/awesomeConfig.cmake
@@ -199,16 +199,6 @@ else()
     message(STATUS "checking for execinfo -- not found")
 endif()
 
-# __builtin_clz is available since gcc 3.4
-try_compile(HAS___BUILTIN_CLZ
-    ${CMAKE_BINARY_DIR}
-    ${CMAKE_SOURCE_DIR}/build-tests/__builtin_clz.c)
-if(HAS___BUILTIN_CLZ)
-    message(STATUS "checking for __builtin_clz -- yes")
-else()
-    message(STATUS "checking for __builtin_clz -- no")
-endif()
-
 set(AWESOME_REQUIRED_LDFLAGS
     ${AWESOME_COMMON_REQUIRED_LDFLAGS}
     ${AWESOME_REQUIRED_LDFLAGS}
diff --git a/build-tests/__builtin_clz.c b/build-tests/__builtin_clz.c
deleted file mode 100644
index b4ab53785..000000000
--- a/build-tests/__builtin_clz.c
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * build-tests/__builtin_clz.c
- *
- * test if the compiler has __builtin_clz().
- */
-
-int
-main(void)
-{
-
-	return (__builtin_clz(42));
-}
-
-// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
diff --git a/config.h b/config.h
index 94c64070a..b599a90ed 100644
--- a/config.h
+++ b/config.h
@@ -7,7 +7,6 @@
 
 #cmakedefine WITH_DBUS
 #cmakedefine HAS_EXECINFO
-#cmakedefine HAS___BUILTIN_CLZ
 
 #endif //_CONFIG_H_