$FG ROOT
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$FG_ROOT is refered to as the main directory of FlightGear, containing the so called base package (default aircraft and scenery, GUI files etc). When running FlightGear from a command line, you can set $FG_ROOT via --fg-root=path/to/root. In FGRun, it is set on the paths page, previous to the aircraft selection page.
On Mac OS X, $FG_ROOT is not installed automatically. See New to FlightGear for an installation manual.
As of FlightGear 2.4.0, it is advised to install additional scenery and aircraft in $FG_SCENERY and $FG_AIRCRAFT directories outside $FG_ROOT. This allow for maintaining the additional stuff when installing a new version of FlightGear.
Common paths
- Mac OS X: Applications/FlightGear.app/Contents/Resources/data/
- Ubuntu: /usr/share/games/flightgear/
- Windows: %ProgramFiles%/FlightGear/data/