Exporting classes with internal linkage does not make sense, do not do it.

gin/object_template_builder.h

Index: gin/object_template_builder.h
diff --git a/gin/object_template_builder.h b/gin/object_template_builder.h
index 3d025a9deb145337840c0737734d744ef302a67f..1305d5ce3ac934de11682e136422203d6745b3f3 100644
--- a/gin/object_template_builder.h
+++ b/gin/object_template_builder.h
@@ -71,7 +71,7 @@ struct CallbackTraits<T, typename base::enable_if<
 // This specialization allows people to construct function templates directly if
 // they need to do fancier stuff.
 template<>
-struct GIN_EXPORT CallbackTraits<v8::Handle<v8::FunctionTemplate> > {
+struct CallbackTraits<v8::Handle<v8::FunctionTemplate> > {
   static v8::Handle<v8::FunctionTemplate> CreateTemplate(
       v8::Handle<v8::FunctionTemplate> templ) {
     return templ;