Mac OS X undefined function gmp_strval() in /Library/WebServer/Documents/flightairmap/require/class.SBS.php:26

Ysurac / FlightAirMap

Open source project displaying live aircrafts, ships or trackers on 2D/3D map. Browse through the data based on a particular aircraft, airline, airport, tracker or vessel to search through the database or see extensive statistics. Can use ADS-B in SBS1 format (dump1090, Radarcape,...), VRS, VA (VATSIM, IVAO whazzup.txt, phpvms,...), ACARS (acarsdec, acarsdeco2), APRS, AIS as datasource.

GNU Affero General Public License v3.0

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After going through the install on Mac OS X, populating everything, I attempt to run daemon-spotter.php manually and get

Fatal error: Uncaught Error: Call to undefined function gmp_strval() in /Library/WebServer/Documents/flightairmap/require/class.SBS.php:26
Stack trace:
#0 /Library/WebServer/Documents/flightairmap/scripts/daemon-spotter.php(1735): SBS->parse('MSG,4,1,1,A48E9...')
#1 {main}
  thrown in /Library/WebServer/Documents/flightairmap/require/class.SBS.php on line 26

PHP is install via brew

$ php -version
PHP 7.3.6 (cli) (built: Jun 17 2019 08:40:34) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.6, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.3.6, Copyright (c) 1999-2018, by Zend Technologies

gmp support is builtin

$ php -i |grep "gmp "
gmp support => enabled

Ysurac / FlightAirMap

Mac OS X undefined function gmp_strval() in /Library/WebServer/Documents/flightairmap/require/class.SBS.php:26 #435