diff --git a/grunt/config/jsx/debug.json b/grunt/config/jsx/debug.json
deleted file mode 100644
index 1596c562e8..0000000000
--- a/grunt/config/jsx/debug.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "debug": true,
-    "constants": {
-        "__DEV__": true
-    }
-}
diff --git a/grunt/config/jsx/jsx.js b/grunt/config/jsx/jsx.js
index 72719a6bad..02c220b5da 100644
--- a/grunt/config/jsx/jsx.js
+++ b/grunt/config/jsx/jsx.js
@@ -1,13 +1,25 @@
 'use strict';
 
+var grunt = require('grunt');
+
 var rootIDs = [
   "React",
   "ReactTransitionGroup"
 ];
 
+var getDebugConfig = function() {
+  return {
+    "debug": true,
+    "constants": {
+      "__VERSION__": grunt.config.data.pkg.version,
+      "__DEV__": true
+    }
+  };
+};
+
 var debug = {
   rootIDs: rootIDs,
-  configFile: "grunt/config/jsx/debug.json",
+  getConfig: getDebugConfig,
   sourceDir: "src",
   outputDir: "build/modules"
 };
@@ -16,7 +28,7 @@ var jasmine = {
   rootIDs: [
     "all"
   ],
-  configFile: debug.configFile,
+  getConfig: getDebugConfig,
   sourceDir: "vendor/jasmine",
   outputDir: "build/jasmine"
 };
@@ -26,18 +38,37 @@ var test = {
     "test/all.js",
     "**/__tests__/*.js"
   ]),
-  configFile: "grunt/config/jsx/test.json",
+  getConfig: function() {
+    return {
+      "debug": true,
+      "mocking": true,
+      "constants": {
+        "__VERSION__": grunt.config.data.pkg.version,
+        "__DEV__": true
+      }
+    };
+  },
   sourceDir: "src",
   outputDir: "build/modules"
 };
 
+
 var release = {
   rootIDs: rootIDs,
-  configFile: "grunt/config/jsx/release.json",
+  getConfig: function() {
+    return {
+      "debug": false,
+      "constants": {
+        "__VERSION__": grunt.config.data.pkg.version,
+        "__DEV__": false
+      }
+    };
+  },
   sourceDir: "src",
   outputDir: "build/modules"
 };
 
+
 module.exports = {
   debug: debug,
   jasmine: jasmine,
diff --git a/grunt/config/jsx/release.json b/grunt/config/jsx/release.json
deleted file mode 100644
index 1dd48f20fd..0000000000
--- a/grunt/config/jsx/release.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "debug": false,
-    "constants": {
-        "__DEV__": false
-    }
-}
diff --git a/grunt/config/jsx/test.json b/grunt/config/jsx/test.json
deleted file mode 100644
index e897023aab..0000000000
--- a/grunt/config/jsx/test.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-    "debug": true,
-    "mocking": true,
-    "constants": {
-        "__DEV__": true
-    }
-}
diff --git a/grunt/tasks/jsx.js b/grunt/tasks/jsx.js
index b84be32cb4..8d777d0069 100644
--- a/grunt/tasks/jsx.js
+++ b/grunt/tasks/jsx.js
@@ -24,7 +24,7 @@ module.exports = function() {
   });
 
   args.push.apply(args, rootIDs);
-  args.push("--config", config.configFile);
+  args.push("--config" /* from stdin */);
 
   var child = spawn({
     cmd: "bin/jsx-internal",
@@ -38,6 +38,9 @@ module.exports = function() {
     }
   });
 
+  child.stdin.write(JSON.stringify(config.getConfig()));
+  child.stdin.end();
+
   child.stdout.pipe(process.stdout);
   child.stderr.pipe(process.stderr);
 };
diff --git a/src/.jshintrc b/src/.jshintrc
index 60ff8d05c2..f098432e6d 100644
--- a/src/.jshintrc
+++ b/src/.jshintrc
@@ -19,6 +19,7 @@
   "unused": "vars",
 
   "globals": {
+    "__VERSION__": false,
     "__DEV__": false,
     "require": false,
     "module": false,
diff --git a/src/core/React.js b/src/core/React.js
index 80e21e806c..5e7aeaf3ac 100644
--- a/src/core/React.js
+++ b/src/core/React.js
@@ -50,4 +50,8 @@ var React = {
   isValidComponent: ReactComponent.isValidComponent
 };
 
+// Version exists only in the open-source version of React, not in Facebook's
+// internal version.
+React.version = __VERSION__;
+
 module.exports = React;