diff --git a/builds/gyp/platform.hpp b/builds/gyp/platform.hpp
index ae3db3e3..0b50178d 100644
--- a/builds/gyp/platform.hpp
+++ b/builds/gyp/platform.hpp
@@ -33,6 +33,11 @@
 //  This file provides the configuration for Linux, Windows, and OS/X
 //  as determined by ZMQ_HAVE_XXX macros passed from project.gyp
 
+//  Check that we're being called from our gyp makefile
+#ifndef ZMQ_GYP_BUILD
+#   error "foreign platform.hpp detected, please re-configure"
+#endif
+
 //  Set for all platforms
 #define ZMQ_HAVE_CURVE 1
 #define ZMQ_USE_TWEETNACL 1
diff --git a/builds/gyp/project.gyp b/builds/gyp/project.gyp
index f8323a0c..37130338 100644
--- a/builds/gyp/project.gyp
+++ b/builds/gyp/project.gyp
@@ -15,7 +15,10 @@
       '.'
     ],
     'defines': [
-      'ZMQ_CUSTOM_PLATFORM_HPP'
+      '_REENTRANT',
+      '_THREAD_SAFE',
+      'ZMQ_CUSTOM_PLATFORM_HPP',
+      'ZMQ_GYP_BUILD'
     ],
     'conditions': [
       [ 'OS=="win"', {
@@ -264,6 +267,14 @@
         '../../src/yqueue.hpp',
         '../../src/zmq.cpp',
         '../../src/zmq_utils.cpp'
+      ],
+      'copies': [
+        {
+          'destination': '../../src',
+          'files': [
+              'platform.hpp'
+          ]
+        }
       ]
     }
   ]