@@ -175,10 +175,12 @@
 	OBJCFLAGS="$OBJCFLAGS -fno-constant-cfstrings"
 	AC_SUBST(NO_CONST_CFSTRINGS, "-fno-constant-cfstrings")
 ])
 AX_CHECK_COMPILER_FLAGS([-Wsign-compare -Werror],
 	[OBJCFLAGS="$OBJCFLAGS -Wsign-compare"])
+AX_CHECK_COMPILER_FLAGS([-Wshadow -Werror],
+	[OBJCFLAGS="$OBJCFLAGS -Wshadow"])
 AX_CHECK_COMPILER_FLAGS([-Wshorten-64-to-32 -Werror],
 	[OBJCFLAGS="$OBJCFLAGS -Wshorten-64-to-32"])
 AX_CHECK_COMPILER_FLAGS([-Wundeclared-selector -Werror],
 	[OBJCFLAGS="$OBJCFLAGS -Wundeclared-selector"])
 AX_CHECK_COMPILER_FLAGS([-Wsemicolon-before-method-body -Werror],