diff --git a/gx/sdk_defines.h b/gx/sdk_defines.h
new file mode 100644
index 0000000000..1dab8451d0
--- /dev/null
+++ b/gx/sdk_defines.h
@@ -0,0 +1,24 @@
+#ifndef _GX_SDK_DEFINES_H
+#define _GX_SDK_DEFINES_H
+
+#ifdef GEKKO
+
+#ifndef OSInitMutex
+#define OSThread lwp_t
+#define OSCond lwpq_t
+#define OSThreadQueue lwpq_t
+
+#define OSInitMutex(mutex) LWP_MutexInit(mutex, 0)
+
+#define OSInitCond(cond) LWP_CondInit(cond)
+#define OSSignalCond(cond) LWP_ThreadSignal(cond)
+
+#define OSInitThreadQueue(queue) LWP_InitQueue(queue)
+#define OSSleepThread(queue) LWP_ThreadSleep(queue)
+
+#define OSCreateThread(thread, func, intarg, ptrarg, stackbase, stacksize, priority, attrs) LWP_CreateThread(thread, func, ptrarg, stackbase, stacksize, priority)
+#endif
+
+#endif
+
+#endif