--- qt-everywhere-src-6.8.2.old/qtwebengine/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/db/column/utils.cc
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/db/column/utils.cc
@@ -40,12 +40,12 @@
 
     case FilterOp::kLe:
     case FilterOp::kGt:
-      *sql_val = SqlValue::Long(static_cast<int64_t>(std::floor(double_val)));
+      *sql_val = SqlValue::Long(static_cast<int64_t>(floor(double_val)));
       return SearchValidationResult::kOk;
 
     case FilterOp::kLt:
     case FilterOp::kGe:
-      *sql_val = SqlValue::Long(static_cast<int64_t>(std::ceil(double_val)));
+      *sql_val = SqlValue::Long(static_cast<int64_t>(ceil(double_val)));
       return SearchValidationResult::kOk;
 
     case FilterOp::kIsNotNull:
--- qt-everywhere-src-6.8.2.old/qtwebengine/src/3rdparty/chromium/third_party/pdfium/core/fpdfapi/page/cpdf_psengine.cpp
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/pdfium/core/fpdfapi/page/cpdf_psengine.cpp
@@ -75,7 +75,7 @@
 // Round half up is a nearest integer round with half-way numbers always rounded
 // up. Example: -5.5 rounds to -5.
 float RoundHalfUp(float f) {
-  if (isnan(f))
+  if (std::isnan(f))
     return 0;
   if (f > std::numeric_limits<float>::max() - 0.5f)
     return std::numeric_limits<float>::max();
--- qt-everywhere-src-6.8.2.old/qtwebengine/src/3rdparty/chromium/third_party/pdfium/fxjs/cjs_publicmethods.cpp
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/pdfium/fxjs/cjs_publicmethods.cpp
@@ -41,6 +41,8 @@
 #include "third_party/base/numerics/safe_conversions.h"
 #include "v8/include/v8-container.h"
 
+using namespace std;
+
 // static
 const JSMethodSpec CJS_PublicMethods::GlobalFunctionSpecs[] = {
     {"AFDate_Format", AFDate_Format_static},
--- qt-everywhere-src-6.8.2.old/qtwebengine/src/3rdparty/chromium/third_party/pdfium/fxjs/xfa/cfxjse_formcalc_context.cpp
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/pdfium/fxjs/xfa/cfxjse_formcalc_context.cpp
@@ -53,6 +53,8 @@
 using pdfium::fxjse::kClassTag;
 using pdfium::fxjse::kFuncTag;
 
+using namespace std;
+
 namespace {
 
 // Maximum number of characters Acrobat can fit in a text box.
--- qt-everywhere-src-6.8.2.old/qtwebengine/src/3rdparty/chromium/media/mojo/services/webrtc_video_perf_history.cc
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/media/mojo/services/webrtc_video_perf_history.cc
@@ -23,6 +23,8 @@
 #include "media/capabilities/bucket_utility.h"
 #include "media/mojo/mojom/media_types.mojom.h"
 
+using namespace std;
+
 namespace media {
 
 namespace {
--- qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/platform/graphics/color.cc.000
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/platform/graphics/color.cc
@@ -40,6 +40,8 @@
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/color_conversions.h"
 
+using namespace std;
+
 namespace blink {
 
 const Color Color::kBlack = Color(0xFF000000);
--- qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/style/style_crossfade_image.cc.000
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/style/style_crossfade_image.cc
@@ -10,6 +10,8 @@
 #include "third_party/blink/renderer/core/style/style_generated_image.h"
 #include "third_party/blink/renderer/platform/graphics/crossfade_generated_image.h"
 
+using namespace std;
+
 namespace blink {
 
 StyleCrossfadeImage::StyleCrossfadeImage(cssvalue::CSSCrossfadeValue& value,
--- qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/css/properties/css_color_function_parser.cc.000
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/css/properties/css_color_function_parser.cc
@@ -13,6 +13,8 @@
 #include "third_party/blink/renderer/core/css/properties/css_parsing_utils.h"
 #include "third_party/blink/renderer/core/css_value_keywords.h"
 
+using namespace std;
+
 namespace blink {
 
 static Color::ColorSpace CSSValueIDToColorSpace(const CSSValueID& id) {
--- qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/html/track/vtt/vtt_cue_layout_algorithm.cc.000
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/html/track/vtt/vtt_cue_layout_algorithm.cc
@@ -12,6 +12,8 @@
 #include "third_party/blink/renderer/core/layout/inline/inline_cursor.h"
 #include "third_party/blink/renderer/core/layout/layout_inline.h"
 
+using namespace std;
+
 namespace blink {
 
 namespace {
--- qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/streams/miscellaneous_operations.cc.000
+++ qt-everywhere-src-6.8.2/qtwebengine/src/3rdparty/chromium/third_party/blink/renderer/core/streams/miscellaneous_operations.cc
@@ -22,6 +22,8 @@
 #include "third_party/blink/renderer/platform/heap/visitor.h"
 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
 
+using namespace std;
+
 namespace blink {
 
 namespace {