Hello! Is there a bug in eCosThreadUtils.h line 64: #ifndef NO_THREADS typedef int THREAD_ID; #else typedef pthread_t THREAD_ID: #endif Shouldn't it be reversed, so that if NO_THREADS is defined that THREAD_ID is typdef'd as int ? But the real question is: Is this still valid ? As I don't see that NO_THREADS could be defined somewhere. It should either be replaced by a pthreads configure test or (which I would opt for) be removed completly (as well in eCosThreadUtils.cpp). Regards, Lars