diff --git a/ext/f2c_libs/arith.h b/ext/f2c_libs/arith.h
new file mode 100644
index 000000000..995e5b254
--- /dev/null
+++ b/ext/f2c_libs/arith.h
@@ -0,0 +1,3 @@
+#define IEEE_8087
+#define Arith_Kind_ASL 1
+#define Double_Align