[Flightgear-users] Error while compiling FlightGear

[Denss A. CO CH <and...@ci...>]

Hello,

I tried to compile Flightgear version 0.7.6 and I get the following error
message:

obj.cxx: In function `float fgTriArea(float *, float *, float *)':
obj.cxx:293: `SG_HALF' undeclared (first use this function)
obj.cxx:293: (Each undeclared identifier is reported only once
obj.cxx:293: for each function it appears in.)
make[2]: *** [obj.o] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all-recursive] Error 1

Inspecting line 293 of obj.cxx, it seems, that SG_HALF
is either a constant or a function, that has never been 
declared and has therefore no numerical value assigned.

Can anyone tell me, which function or header to include,
that supplies the requested numerical value ?

Thanks for your help

A. Denss