Fix compile error

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@300041 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/xray/xray_fdr_logging.cc b/lib/xray/xray_fdr_logging.cc
index 5c6bbd4..c5b63b0 100644
--- a/lib/xray/xray_fdr_logging.cc
+++ b/lib/xray/xray_fdr_logging.cc
@@ -17,6 +17,7 @@
 #include "xray_fdr_logging.h"
 #include <algorithm>
 #include <bitset>
+#include <cerrno>
 #include <cstring>
 #include <sys/syscall.h>
 #include <sys/time.h>