--- third_party/libsync/src/include/sync/sync.h.orig	2020-02-21 07:43:33.748325175 -0500
+++ third_party/libsync/src/include/sync/sync.h	2020-02-21 07:44:07.288328784 -0500
@@ -19,12 +19,16 @@
 #ifndef __SYS_CORE_SYNC_H
 #define __SYS_CORE_SYNC_H
 
+#if defined(__GLIBC__)
 #include <sys/cdefs.h>
+#endif
 #include <stdint.h>
 
 #include <linux/types.h>
 
-__BEGIN_DECLS
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 struct sync_legacy_merge_data {
  int32_t fd2;
@@ -158,6 +162,8 @@
                                   struct sync_pt_info *itr);
 void sync_fence_info_free(struct sync_fence_info_data *info);
 
-__END_DECLS
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* __SYS_CORE_SYNC_H */