diff --git a/indra/newview/app_settings/shaders/class1/effects/PosterizeF.glsl b/indra/newview/app_settings/shaders/class1/effects/PosterizeF.glsl
index 1da0cdbad..0f8b2f8f2 100644
--- a/indra/newview/app_settings/shaders/class1/effects/PosterizeF.glsl
+++ b/indra/newview/app_settings/shaders/class1/effects/PosterizeF.glsl
@@ -8,7 +8,9 @@
 #extension GL_ARB_texture_rectangle : enable
  
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 gl_FragColor;
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
 #endif
 
 uniform sampler2DRect tex0;
@@ -18,6 +20,6 @@ VARYING vec2 vary_texcoord0;
 
 void main(void) 
 {
-	vec3 color = pow(floor(pow(vec3(texture2D(tex0, vary_texcoord0.st)),vec3(.6)) * layerCount)/layerCount,vec3(1.66666));
-	gl_FragColor = vec4(color, 1.0);
+	vec3 color = pow(floor(pow(vec3(texture2DRect(tex0, vary_texcoord0.st)),vec3(.6)) * layerCount)/layerCount,vec3(1.66666));
+	frag_color = vec4(color, 1.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/effects/colorFilterF.glsl b/indra/newview/app_settings/shaders/class1/effects/colorFilterF.glsl
index cf0dbee8d..e03b83113 100644
--- a/indra/newview/app_settings/shaders/class1/effects/colorFilterF.glsl
+++ b/indra/newview/app_settings/shaders/class1/effects/colorFilterF.glsl
@@ -8,9 +8,12 @@
 #extension GL_ARB_texture_rectangle : enable
  
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 gl_FragColor;
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
 #endif
 
+
 uniform sampler2DRect tex0;
 uniform float brightness;
 uniform float contrast;
@@ -38,5 +41,5 @@ void main(void)
 	/// Modulate saturation
 	color = mix(vec3(dot(color, lumWeights)), color, saturation);
 
-	gl_FragColor = vec4(color, 1.0);
+	frag_color = vec4(color, 1.0);
 }
diff --git a/indra/newview/app_settings/shaders/class1/effects/gaussBlurF.glsl b/indra/newview/app_settings/shaders/class1/effects/gaussBlurF.glsl
index 1bb7046c2..6c56e2108 100644
--- a/indra/newview/app_settings/shaders/class1/effects/gaussBlurF.glsl
+++ b/indra/newview/app_settings/shaders/class1/effects/gaussBlurF.glsl
@@ -1,7 +1,9 @@
 #extension GL_ARB_texture_rectangle : enable
 
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 gl_FragColor;
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
 #endif
 
 uniform sampler2DRect tex0;
@@ -31,5 +33,5 @@ void main(void)
 		color += weight.z * vec3(texture2DRect(tex0, vec2(vary_texcoord0.s,vary_texcoord0.t+offset.t)));
 		color += weight.z * vec3(texture2DRect(tex0, vec2(vary_texcoord0.s,vary_texcoord0.t-offset.t)));
 	}
-	gl_FragColor = vec4(color.xyz,1.0);
-}
\ No newline at end of file
+	frag_color = vec4(color.xyz,1.0);
+}
diff --git a/indra/newview/app_settings/shaders/class1/effects/nightVisionF.glsl b/indra/newview/app_settings/shaders/class1/effects/nightVisionF.glsl
index 793ff201a..6257c4e9b 100644
--- a/indra/newview/app_settings/shaders/class1/effects/nightVisionF.glsl
+++ b/indra/newview/app_settings/shaders/class1/effects/nightVisionF.glsl
@@ -8,7 +8,9 @@
 #extension GL_ARB_texture_rectangle : enable
 
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 gl_FragColor;
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
 #endif
 
 uniform sampler2DRect tex0;
@@ -48,5 +50,5 @@ void main(void)
 	
 	outColor += noiseValue;
 
-	gl_FragColor = vec4(outColor, 1.0);
+	frag_color = vec4(outColor, 1.0);
 }