diff --git a/multimedia/ringrtc/files/patch-src_webrtc_src_third__party_abseil-cpp_absl_base_internal_unscaledcycleclock.cc b/multimedia/ringrtc/files/patch-src_webrtc_src_third__party_abseil-cpp_absl_base_internal_unscaledcycleclock.cc
new file mode 100644
index 000000000000..fb15995c2be3
--- /dev/null
+++ b/multimedia/ringrtc/files/patch-src_webrtc_src_third__party_abseil-cpp_absl_base_internal_unscaledcycleclock.cc
@@ -0,0 +1,14 @@
+--- ../../src/webrtc/src/third_party/abseil-cpp/absl/base/internal/unscaledcycleclock.cc.orig	2020-08-09 20:09:49 UTC
++++ ../../src/webrtc/src/third_party/abseil-cpp/absl/base/internal/unscaledcycleclock.cc
+@@ -24,8 +24,10 @@
+ #ifdef __GLIBC__
+ #include <sys/platform/ppc.h>
+ #elif defined(__FreeBSD__)
+-#include <sys/sysctl.h>
++#include "absl/base/call_once.h"
+ #include <sys/types.h>
++#include <sys/sysctl.h>
++#include <threads.h>
+ #endif
+ #endif
+