include sched.h to get sched_yield() prototype

diff --git a/src/mesa/drivers/dri/common/vblank.h b/src/mesa/drivers/dri/common/vblank.h
index d460d7a..718ecd7 100644 (file)
--- a/src/mesa/drivers/dri/common/vblank.h
+++ b/src/mesa/drivers/dri/common/vblank.h
@@ -53,6 +53,7 @@ extern int driWaitForVBlank( const __DRIdrawablePrivate *priv,
 
 #undef usleep
 #include <unistd.h>  /* for usleep() */
+#include <sched.h>   /* for sched_yield() */
 
 #define DO_USLEEP(nr)                                                  \
    do {                                                                        \