diff --git a/ci/config.mk.clang.sed b/ci/config.mk.clang.sed
new file mode 100644
index 0000000..40c6705
--- /dev/null
+++ b/ci/config.mk.clang.sed
@@ -0,0 +1 @@
+/^RUBY_CFLAGS\b/s/$/ -Wno-error=unknown-attributes -Wno-error=ignored-attributes/