As John W., I've downloaded the sources and compared the opengc_data.hxx in the two codes, and there are some parameters of the class ogcFGData in the FG side that are missing in the opengc source:
int reserved; .. // position double elevation; .. // engine data double oil_temp; double oil_quantity; double hyd_pressure; ... // fuel system double main_tank; double tank;
That's because opengc can't receive the data from FG? I'll try to compile, now getting libraries...
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