diff --git a/gcc/gthr-posix.h b/gcc/gthr-posix.h
index 364473dbdaee..2bbcc35a9f19 100644
--- a/gcc/gthr-posix.h
+++ b/gcc/gthr-posix.h
@@ -90,6 +90,12 @@ __gthread_active_p (void)
 
 #ifdef _LIBOBJC
 
+#include <auto-host.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
 /* Key structure for maintaining thread specific storage */
 static pthread_key_t _objc_thread_storage;
 static pthread_attr_t _objc_thread_attribs;