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+Enabling and disabling devices and features
+-------------------------------------------
+
+Support for various devices and features may be enabled
+and/or disabled by setting the variables ENABLE and DISABLE
+before running gpsd.SlackBuild, for example
+
+ENABLE=garmintxt DISABLE="garmin dbus" ./gpsd.SlackBuild
+
+
+The following devices and features may be enabled
+(by default they are disabled).
+
+ garmintxt enable Garmin Simple Text support
+ tnt enable True North Technologies support
+ oceanserver enable OceanServer support
+ profiling enable profiling support
+ pps-on-cts Enable PPS pulse on CTS rather than DCD
+ gpsd-user=username
+ GPSD privilege revokation user (default 'nobody')
+ fixed-port-speed=nnn
+ compile with fixed serial port speed
+ max-clients=nnn
+ compile with limited maximum clients
+ max-devices=nnn
+ compile with maximum allowed devices
+ squelch squelch gpsd_report and gpsd_hexdump to save cpu
+
+
+The following devices and features may be disabled
+(by default they are enabled).
+
+ dbus disable DBUS support
+ nmea disable NMEA support
+ sirf disable SiRF chipset support
+ superstar2 disable SuperStarII chipset support
+ tsip disable Trimble TSIP support
+ fv18 disable San Jose Navigation FV-18 support
+ tripmate disable DeLorme TripMate support
+ earthmate disable DeLorme EarthMate Zodiac support
+ itrax disable iTrax hardware support
+ ashtech disable Ashtech support
+ navcom disable Navcom support
+ garmin disable Garmin kernel driver support
+ ubx disable UBX Protocol support
+ evermore disable EverMore binary support
+ mkt3301 disable MKT-3301 support
+ gpsclock disable GPSClock support
+ rtcm104v2 disable rtcm104v2 support
+ rtcm104v3 disable rtcm104v3 support
+ ntrip disable NTRIP support
+ aivdm disable Aivdm support
+ ntpshm disable NTP time hinting support
+ pps disable PPS time syncing support
+ reconfigure do not allow gpsd to change device settings
+ controlsend do not allow gpsd to change device settings