Shader build error - Pink on export

[nickpittom]

Builds are turning Pink on Valve VR standard shader (and other lab shaders)

Previously I've been using 5.4.0p1, and recently got an error:

http://i.imgur.com/HGruBq2.png

Is there a known bug here? A known fix?

I've seen previously that using 'additive' does the same, however I am not using additive and actually even on a new scene with nothing in it it still occurs, which leads me to believe the shader is at fault

EDIT: Ok... problem solved perhaps. I commented out the entire IF statement surrounding the bug and it appears to work. As I have no real idea what it does (not really) I don't know if this breaks anything else... but for now I'm happy.

[KevinComerford]

It flips the normal direction of double sided materials. Commenting out this code makes solid double sided objects look strange. Ironically, it works well with leafs making them look translucent.

[nickpittom]

Commenting it out seems to work, strangely, but I guess I'll keep an eye out for issues