Why does this shader give me a white sky?

I have started work on adding a dynamic sky box to my game. As a starting experiment, I changed the Sky.frag to the following:

void main() {
    //vec3 dir = normalize(direction);
    gl_FragColor = (0.1, 0.2, 0.1, 1.0);

I expected a deep green sky, but I get white. Any setting gives me white except if set I alpha to 0, then I get black. I haven’t changed anything else in SkyFactory, so why doesn’t my shader set the color? Also, the solid white does not seem to mix correctly with the fog.

Shouldn’t it be

gl_FragColor = vec4(0.1,0.2,0.1,1.0);


Er, yes. I’ve been doing tech support all day long, if that’s any excuse.

How did that compile??? :-/

Works nicely now. At least while trying to debug it I stripped down SkyFactory to the three or four lines of code I need.