Hi,
I think there are errors in amt_jtagaccel.c
I attach a small patch that I needed to make it compile.
 
        aw_scan_tms_5 = 0x40 | (tms_scan[0] & 0x1f);
        AMT_AW(aw_scan_tms_5);
+        int jtag_speed=0;
        int retval = jtag_get_speed(&jtag_speed);
        assert(retval == ERROR_OK);
        if (jtag_speed > 3 || rtck_enabled)
 
        int jtag_speed_var;
        int retval = jtag_get_speed(&jtag_speed_var);
+       if (retval != ERROR_OK)
+          return retval;
        amt_jtagaccel_speed(jtag_speed_var);
 
        enum reset_types jtag_reset_config = jtag_get_reset_config();