diff --git a/build/Gruntfile.js b/build/Gruntfile.js
index ff4862b6b..5c0ceaa08 100644
--- a/build/Gruntfile.js
+++ b/build/Gruntfile.js
@@ -102,14 +102,42 @@ module.exports = function(grunt) {
     }
 
     function doRegisterInitializeAppTask(name, appName, configFile) {
+        if ( !!process.env['EXTRA_CONFIG_PATH'] &&
+                grunt.file.exists(process.env['EXTRA_CONFIG_PATH'] + '/' + configFile) )
+        {
+            var _extConfig = require(process.env['EXTRA_CONFIG_PATH'] + '/' + configFile);
+        }
+
         return grunt.registerTask('init-build-' + name, 'Initialize build ' + appName, function(){
             defaultConfig = configFile;
             packageFile = require('./' + defaultConfig);
 
-            if (packageFile)
+            if (packageFile) {
                 grunt.log.ok(appName + ' config loaded successfully'.green);
-            else
-                grunt.log.error().writeln('Could not load config file'.red);
+
+                if ( !!_extConfig && _extConfig.name == packageFile.name ) {
+                    function _merge(target, ...sources) {
+                        if (!sources.length) return target;
+                        const source = sources.shift();
+
+                        if (_.isObject(target) && _.isObject(source)) {
+                            for (const key in source) {
+                                if (_.isObject(source[key])) {
+                                    if (!target[key]) Object.assign(target, { [key]: {} });
+                                    else if (_.isArray(source[key])) target[key].push(...source[key]);
+                                    else _merge(target[key], source[key]);
+                                } else {
+                                    Object.assign(target, { [key]: source[key] });
+                                }
+                            }
+                        }
+
+                        return _merge(target, ...sources);
+                    }
+
+                    _merge(packageFile, _extConfig);
+                }
+            } else grunt.log.error().writeln('Could not load config file'.red);
         });
     }