diff -Naur mozjs-45.0.2-orig/js/src/moz.build mozjs-45.0.2/js/src/moz.build
--- mozjs-45.0.2-orig/js/src/moz.build	2017-11-15 19:53:21.810535115 +0300
+++ mozjs-45.0.2/js/src/moz.build	2017-11-15 19:50:45.435537988 +0300
@@ -66,7 +66,12 @@
     'js.pc',
 ]
 
-if not CONFIG['JS_STANDALONE']:
+if CONFIG['JS_STANDALONE']:
+    DEFINES['IMPL_MFBT'] = True
+    USE_LIBS += [
+        'mfbt',
+    ]
+else:
     CONFIGURE_SUBST_FILES += [
         '../../config/autoconf-js.mk',
         '../../config/emptyvars-js.mk',