Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -180,10 +180,12 @@
 
 		AX_CHECK_COMPILER_FLAGS(-fno-objc-nonfragile-abi, [
 			OBJCFLAGS="$OBJCFLAGS -fno-objc-nonfragile-abi"
 			GNU_RUNTIME="$GNU_RUNTIME -fno-objc-nonfragile-abi"
 		])
+		AX_CHECK_COMPILER_FLAGS(-Wno-deprecated-objc-isa-usage,
+			[OBJCFLAGS="$OBJCFLAGS -Wno-deprecated-objc-isa-usage"])
 
 		AC_SUBST(GNU_RUNTIME)
 
 		AC_SUBST(RUNTIME, "runtime")
 		if test x"$enable_shared" != x"no"; then