diff --git a/acinclude.m4 b/acinclude.m4
index 30169ac..be94c35 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2897,34 +2897,6 @@ AC_DEFUN([AC_CHECK_BOOL],
   AC_DEFINE_UNQUOTED(HAVE_BOOL, 1, [You _must_ have bool])
 ])
 
-AC_DEFUN([AC_CHECK_GNU_EXTENSIONS],
-[
-AC_MSG_CHECKING(if you need GNU extensions)
-AC_CACHE_VAL(ac_cv_gnu_extensions,
-[
-cat > conftest.c << EOF
-#include <features.h>
-
-#ifdef __GNU_LIBRARY__
-yes
-#endif
-EOF
-
-if (eval "$ac_cpp conftest.c") 2>&5 |
-  egrep "yes" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_gnu_extensions=yes
-else
-  ac_cv_gnu_extensions=no
-fi
-])
-
-AC_MSG_RESULT($ac_cv_gnu_extensions)
-if test "$ac_cv_gnu_extensions" = "yes"; then
-  AC_DEFINE_UNQUOTED(_GNU_SOURCE, 1, [Define if you need to use the GNU extensions])
-fi
-])
-
 AC_DEFUN([KDE_CHECK_COMPILER_FLAG],
 [
 AC_MSG_CHECKING([whether $CXX supports -$1])