diff --git a/chromium-66.0.3359.117-gcc5-r3.patch b/chromium-66.0.3359.117-gcc5-r3.patch
new file mode 100644
index 00000000..56abcf18
--- /dev/null
+++ b/chromium-66.0.3359.117-gcc5-r3.patch
@@ -0,0 +1,38 @@
+diff -up chromium-66.0.3359.117/gpu/ipc/common/mailbox_struct_traits.h.gcc5-r3 chromium-66.0.3359.117/gpu/ipc/common/mailbox_struct_traits.h
+--- chromium-66.0.3359.117/gpu/ipc/common/mailbox_struct_traits.h.gcc5-r3	2018-04-17 21:04:33.000000000 -0400
++++ chromium-66.0.3359.117/gpu/ipc/common/mailbox_struct_traits.h	2018-04-18 12:12:40.065663210 -0400
+@@ -15,7 +15,7 @@ namespace mojo {
+ template <>
+ struct StructTraits<gpu::mojom::MailboxDataView, gpu::Mailbox> {
+   static base::span<const int8_t> name(const gpu::Mailbox& mailbox) {
+-    return mailbox.name;
++    return base::make_span(mailbox.name);
+   }
+   static bool Read(gpu::mojom::MailboxDataView data, gpu::Mailbox* out);
+ };
+diff -up chromium-66.0.3359.117/services/viz/public/cpp/compositing/filter_operation_struct_traits.h.gcc5-r3 chromium-66.0.3359.117/services/viz/public/cpp/compositing/filter_operation_struct_traits.h
+diff -up chromium-66.0.3359.117/services/viz/public/cpp/compositing/quads_struct_traits.h.gcc5-r3 chromium-66.0.3359.117/services/viz/public/cpp/compositing/quads_struct_traits.h
+--- chromium-66.0.3359.117/services/viz/public/cpp/compositing/quads_struct_traits.h.gcc5-r3	2018-04-17 21:04:43.000000000 -0400
++++ chromium-66.0.3359.117/services/viz/public/cpp/compositing/quads_struct_traits.h	2018-04-18 12:12:40.067663160 -0400
+@@ -308,7 +308,7 @@ struct StructTraits<viz::mojom::TextureQ
+   static base::span<const float> vertex_opacity(const viz::DrawQuad& input) {
+     const viz::TextureDrawQuad* quad =
+         viz::TextureDrawQuad::MaterialCast(&input);
+-    return quad->vertex_opacity;
++    return base::make_span(quad->vertex_opacity);
+   }
+ 
+   static bool y_flipped(const viz::DrawQuad& input) {
+diff -up chromium-66.0.3359.117/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h.gcc5-r3 chromium-66.0.3359.117/third_party/WebKit/Source/platform/wtf/typed_arrays/ArrayBufferContents.h
+diff -up chromium-66.0.3359.117/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc.gcc5-r3 chromium-66.0.3359.117/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc
+--- chromium-66.0.3359.117/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc.gcc5-r3	2018-04-17 21:06:20.000000000 -0400
++++ chromium-66.0.3359.117/third_party/webrtc/modules/audio_processing/aec3/aec_state.cc	2018-04-18 12:12:40.068663134 -0400
+@@ -10,7 +10,7 @@
+ 
+ #include "modules/audio_processing/aec3/aec_state.h"
+ 
+-#include <math.h>
++#include <cmath>
+ 
+ #include <numeric>
+ #include <vector>