diff -r 27fb1c3c9fbb -r 97b591813c8b src/linetypes/triangle.cpp
--- a/src/linetypes/triangle.cpp	Sun Mar 13 20:26:28 2022 +0200
+++ b/src/linetypes/triangle.cpp	Tue Mar 15 18:52:48 2022 +0200
@@ -21,7 +21,7 @@
 		this->id));
 }
 
-void ldraw::Triangle::invert()
+void ldraw::Triangle::invert(GetPolygonsContext *)
 {
 	//    0 1 2
 	// -> 1 0 2