@@ -174,10 +174,12 @@
 	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(-Wsemicolon-before-method-body -Werror,
 	[OBJCFLAGS="$OBJCFLAGS -Wsemicolon-before-method-body"])
 AX_CHECK_COMPILER_FLAGS(-Wobjc-missing-property-synthesis -Werror,