--- a/yabause/src/threads.h	2022-01-05 15:41:03.685887385 -0600
+++ b/yabause/src/threads.h	2022-01-05 15:43:05.404177636 -0600
@@ -115,6 +115,8 @@
 
 int YabCopyFile(const char * src, const char * dst);
 int YabMakeCleanDir( const char * dirname );
+
+#include <core.h>
 int YabNanosleep(u64 ns);
 
 ///////////////////////////////////////////////////////////////////////////