In the 'yield' module, there were references to the Win32 API without
#include <windows.h>.
*** lib/glthread/yield.h.orig 2008-08-17 21:53:21.000000000 +0200
--- lib/glthread/yield.h 2008-08-17 21:45:59.000000000 +0200
***************
*** 73,79 ****
/* Use the old Solaris threads library. */
# include <thread.h>
- # include <synch.h>
# ifdef __cplusplus
extern "C" {
--- 73,78 ----
***************
*** 92,97 ****
--- 91,98 ----
#if USE_WIN32_THREADS
+ # include <windows.h>
+
# ifdef __cplusplus
extern "C" {
# endif
