diff --git a/gn/sksl_tests.gni b/gn/sksl_tests.gni
index 9fe303b..1b14664 100644
--- a/gn/sksl_tests.gni
+++ b/gn/sksl_tests.gni
@@ -69,6 +69,7 @@
   "/sksl/errors/InvalidOutParams.sksl",
   "/sksl/errors/InvalidToken.sksl",
   "/sksl/errors/InvalidUnary.sksl",
+  "/sksl/errors/LastFragColorWithoutCaps.sksl",
   "/sksl/errors/LayoutInFunctions.sksl",
   "/sksl/errors/LayoutRepeatedQualifiers.sksl",
   "/sksl/errors/MatrixToVectorCast3x3.sksl",
@@ -161,6 +162,7 @@
 sksl_glsl_tests = [
   "/sksl/glsl/ForceHighPrecision.sksl",
   "/sksl/glsl/IncompleteShortIntPrecision.sksl",
+  "/sksl/glsl/LastFragColor.sksl",
   "/sksl/glsl/LayoutQualifiers.sksl",
   "/sksl/glsl/ShortIntPrecision.sksl",
   "/sksl/glsl/TextureSharpenVersion110.sksl",
diff --git a/resources/sksl/errors/LastFragColorWithoutCaps.sksl b/resources/sksl/errors/LastFragColorWithoutCaps.sksl
new file mode 100644
index 0000000..dbc7649
--- /dev/null
+++ b/resources/sksl/errors/LastFragColorWithoutCaps.sksl
@@ -0,0 +1,3 @@
+void main() {
+    sk_FragColor = sk_LastFragColor;
+}
diff --git a/resources/sksl/glsl/LastFragColor.sksl b/resources/sksl/glsl/LastFragColor.sksl
new file mode 100644
index 0000000..d49af63
--- /dev/null
+++ b/resources/sksl/glsl/LastFragColor.sksl
@@ -0,0 +1,5 @@
+/*#pragma settings FramebufferFetchSupport*/
+
+void main() {
+    sk_FragColor = sk_LastFragColor;
+}
diff --git a/src/sksl/SkSLMain.cpp b/src/sksl/SkSLMain.cpp
index 17102fa..2ab727f 100644
--- a/src/sksl/SkSLMain.cpp
+++ b/src/sksl/SkSLMain.cpp
@@ -139,6 +139,10 @@
                     static auto s_emulateAbsIntCaps = Factory::EmulateAbsIntFunction();
                     *caps = s_emulateAbsIntCaps.get();
                 }
+                if (settingsText.consumeSuffix(" FramebufferFetchSupport")) {
+                    static auto s_fbFetchSupport = Factory::FramebufferFetchSupport();
+                    *caps = s_fbFetchSupport.get();
+                }
                 if (settingsText.consumeSuffix(" IncompleteShortIntPrecision")) {
                     static auto s_incompleteShortIntCaps = Factory::IncompleteShortIntPrecision();
                     *caps = s_incompleteShortIntCaps.get();
diff --git a/src/sksl/SkSLUtil.h b/src/sksl/SkSLUtil.h
index aab1444..f19afb7 100644
--- a/src/sksl/SkSLUtil.h
+++ b/src/sksl/SkSLUtil.h
@@ -89,7 +89,7 @@
         return fGLSLGeneration > k110_GrGLSLGeneration;
     }
 
-    bool fFBFetchSupport = true;
+    bool fFBFetchSupport = false;
     bool fbFetchSupport() const {
         return fFBFetchSupport;
     }
@@ -346,6 +346,13 @@
         return result;
     }
 
+    static ShaderCapsPointer FramebufferFetchSupport() {
+        ShaderCapsPointer result = MakeShaderCaps();
+        result->fFBFetchSupport = true;
+        result->fFBFetchColorName = "gl_LastFragData[0]";
+        return result;
+    }
+
     static ShaderCapsPointer IncompleteShortIntPrecision() {
         ShaderCapsPointer result = MakeShaderCaps();
         result->fVersionDeclString = "#version 310es";
diff --git a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
index 6284a25..8c62aee 100644
--- a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
+++ b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
@@ -777,7 +777,12 @@
             this->write("gl_InstanceID");
             break;
         case SK_LASTFRAGCOLOR_BUILTIN:
-            this->write(this->caps().fbFetchColorName());
+            if (this->caps().fbFetchSupport()) {
+                this->write(this->caps().fbFetchColorName());
+            } else {
+                fContext.fErrors->error(ref.fOffset,
+                                        "sk_LastFragColor requires framebuffer fetch support");
+            }
             break;
         default:
             this->write(ref.variable()->name());
diff --git a/tests/sksl/errors/LastFragColorWithoutCaps.glsl b/tests/sksl/errors/LastFragColorWithoutCaps.glsl
new file mode 100644
index 0000000..59d172a
--- /dev/null
+++ b/tests/sksl/errors/LastFragColorWithoutCaps.glsl
@@ -0,0 +1,4 @@
+### Compilation failed:
+
+error: 2: sk_LastFragColor requires framebuffer fetch support
+1 error
diff --git a/tests/sksl/glsl/LastFragColor.glsl b/tests/sksl/glsl/LastFragColor.glsl
new file mode 100644
index 0000000..c74d66a
--- /dev/null
+++ b/tests/sksl/glsl/LastFragColor.glsl
@@ -0,0 +1,5 @@
+
+out vec4 sk_FragColor;
+void main() {
+    sk_FragColor = gl_LastFragData[0];
+}
diff --git a/tests/sksl/shared/Caps.asm.frag b/tests/sksl/shared/Caps.asm.frag
index 6ee2715..4ba5887 100644
--- a/tests/sksl/shared/Caps.asm.frag
+++ b/tests/sksl/shared/Caps.asm.frag
@@ -42,7 +42,6 @@
 OpStore %y %int_0
 OpStore %z %int_0
 OpStore %x %int_1
-OpStore %y %int_1
 OpStore %z %int_1
 %20 = OpLoad %int %x
 %21 = OpConvertSToF %float %20
diff --git a/tests/sksl/shared/Caps.glsl b/tests/sksl/shared/Caps.glsl
index f4079c3..c4b0cfa 100644
--- a/tests/sksl/shared/Caps.glsl
+++ b/tests/sksl/shared/Caps.glsl
@@ -5,7 +5,6 @@
     int y = 0;
     int z = 0;
     x = 1;
-    y = 1;
     z = 1;
     sk_FragColor.xyz = vec3(float(x), float(y), float(z));
 }
diff --git a/tests/sksl/shared/Caps.metal b/tests/sksl/shared/Caps.metal
index dcff059..18871ef 100644
--- a/tests/sksl/shared/Caps.metal
+++ b/tests/sksl/shared/Caps.metal
@@ -13,7 +13,6 @@
     int y = 0;
     int z = 0;
     x = 1;
-    y = 1;
     z = 1;
     _out.sk_FragColor.xyz = float3(float(x), float(y), float(z));
     return _out;