Program fails to compile after 3.20 upgrade

[David J Taylor]

My GPS monitoring program here:

 https://www.satsignal.eu/raspberry-pi/monitoring.html#gps

fails to compile after upgrading to 3.20 (it used to work).  My C isn't good 
enough to know how to specify the extra arguments which are required. 
Compiler output:

--------------------------------------
pi@RasPi-22:~ $ gcc gpsGetSatellites.c -o gpsGetSatellites -lgps
gpsGetSatellites.c: In function �main�:
gpsGetSatellites.c:26:14: error: too few arguments to function �gps_read�
    status = gps_read (&gpsdata);
             ^~~~~~~~
In file included from gpsGetSatellites.c:12:
/usr/include/gps.h:2307:12: note: declared here
extern int gps_read(struct gps_data_t *, char *message, int message_len);
           ^~~~~~~~
--------------------------------------

(I'm competent in other languages, though!)

Thanks,
David
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