possible mac fix?

shaders/dimensions/composite1.fsh

@@ -43,21 +43,21 @@ uniform int hideGUI;
 uniform sampler2D noisetex; //noise
 uniform sampler2D depthtex0;
 uniform sampler2D depthtex1;
-uniform sampler2D depthtex2;
-
+// uniform sampler2D depthtex2;
+#ifdef DISTANT_HORIZONS
 uniform sampler2D dhDepthTex;
 uniform sampler2D dhDepthTex1;
-
+#endif
 uniform sampler2D colortex0; //clouds
 uniform sampler2D colortex1; //albedo(rgb),material(alpha) RGBA16
 uniform sampler2D colortex2; //translucents(rgba)
 uniform sampler2D colortex3; //filtered shadowmap(VPS)
 // uniform sampler2D colortex4; //LUT(rgb), quarter res depth(alpha)
-uniform sampler2D colortex5; //TAA buffer/previous frame
+// uniform sampler2D colortex5; //TAA buffer/previous frame
 uniform sampler2D colortex6; //Noise
 uniform sampler2D colortex7; //water?
 uniform sampler2D colortex8; //Specular
-uniform sampler2D colortex9; //Specular
+// uniform sampler2D colortex9; //Specular
 uniform sampler2D colortex10;
 uniform sampler2D colortex11;
 uniform sampler2D colortex12;
@@ -88,7 +88,6 @@ uniform float dhFarPlane;
 uniform float dhNearPlane;
 
 flat varying vec3 zMults;
-flat varying vec3 zMults_DH;
 
 uniform vec2 texelSize;
 uniform float viewWidth;