Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -33,10 +33,12 @@
 
 AX_CHECK_COMPILER_FLAGS(-pipe, [OBJCFLAGS="$OBJCFLAGS -pipe"])
 AX_CHECK_COMPILER_FLAGS(-fno-common, [OBJCFLAGS="$OBJCFLAGS -fno-common"])
 AX_CHECK_COMPILER_FLAGS(-Wobjc-missing-property-synthesis -Werror,
 	[OBJCFLAGS="$OBJCFLAGS -Wobjc-missing-property-synthesis"])
+AX_CHECK_COMPILER_FLAGS(-Wno-ignored-attributes -Werror,
+	[OBJCXXFLAGS="$OBJCXXFLAGS -Wno-ignored-attributes"])
 
 AC_CHECK_TOOL(AR, ar)
 AC_PROG_RANLIB
 AC_ARG_ENABLE(shared,
 	AS_HELP_STRING([--disable-shared], [do not build shared library]))