D-ECHO wrote:Well but why wasn't it a fix for old fgs then?
Sure. For 1 plane, (where your include file is within the structure)? yes.
For an expansion pack (where your include file is not within the planeS structure, but within the Pack structure)? No. I don't think you'll solve connecting your plane to an expansion pack this way. And, clearly, such solution is not expandable to a plane collection depending on your pack.
On the "expansion pack" alternative, you need simgear/fgrun to be fixed, not the plane