avoid forward declaration usage of LinearUnits (gcc doesn't like it?)
avoid forward declaration usage of LinearUnits (gcc doesn't like it?)

seanisom/vtp,seanisom/vtp,nakijun/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,nakijun/vtp