+#define E_FLAG_RX_ABI (1 << 3) /* Binary passes stacked arguments using natural alignment. Unofficial - NC. */
+#define E_FLAG_RX_SINSNS_SET (1 << 6) /* Set if bit-5 is significant. */
+#define E_FLAG_RX_SINSNS_YES (1 << 7) /* Set if string instructions are used in the binary. */
+#define E_FLAG_RX_SINSNS_NO 0 /* Bit-5 if this binary must not be linked with a string instruction using binary. */
+#define E_FLAG_RX_SINSNS_MASK (3 << 6) /* Mask of bits used to determine string instruction use. */
+#define E_FLAG_RX_V2 (1 << 8) /* RX v2 instructions */