+
+#define SSH_PROTO_UNKNOWN 0x00
+#define SSH_PROTO_1 0x01
+#define SSH_PROTO_1_PREFERRED 0x02
+#define SSH_PROTO_2 0x04
+
+#define SSH_BUG_SIGBLOB 0x00000001
+#define SSH_BUG_PKSERVICE 0x00000002
+#define SSH_BUG_HMAC 0x00000004
+#define SSH_BUG_X11FWD 0x00000008
+#define SSH_OLD_SESSIONID 0x00000010
+#define SSH_BUG_PKAUTH 0x00000020
+#define SSH_BUG_DEBUG 0x00000040
+#define SSH_BUG_BANNER 0x00000080
+#define SSH_BUG_IGNOREMSG 0x00000100
+#define SSH_BUG_PKOK 0x00000200
+#define SSH_BUG_PASSWORDPAD 0x00000400
+#define SSH_BUG_SCANNER 0x00000800
+#define SSH_BUG_BIGENDIANAES 0x00001000
+#define SSH_BUG_RSASIGMD5 0x00002000
+#define SSH_OLD_DHGEX 0x00004000
+#define SSH_BUG_NOREKEY 0x00008000
+#define SSH_BUG_HBSERVICE 0x00010000
+#define SSH_BUG_OPENFAILURE 0x00020000
+#define SSH_BUG_DERIVEKEY 0x00040000
+#define SSH_BUG_DUMMYCHAN 0x00100000
+#define SSH_BUG_EXTEOF 0x00200000
+#define SSH_BUG_PROBE 0x00400000
+#define SSH_BUG_FIRSTKEX 0x00800000
+#define SSH_OLD_FORWARD_ADDR 0x01000000
+#define SSH_BUG_RFWD_ADDR 0x02000000
+
+void enable_compat13(void);
+void enable_compat20(void);
+void compat_datafellows(const char *);
+int proto_spec(const char *);
+char *compat_cipher_proposal(char *);
+