diff --git a/infra/recipes/gn.expected/ci_linux.json b/infra/recipes/gn.expected/ci_linux.json
index 128c0e6..e63326d 100644
--- a/infra/recipes/gn.expected/ci_linux.json
+++ b/infra/recipes/gn.expected/ci_linux.json
@@ -139,6 +139,44 @@
     ]
   },
   {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.read [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "CXXFLAGS = ['-Wall',  '-Wfoo']",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.write [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall',  '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
     "cmd": [],
     "name": "rpmalloc.build rpmalloc-linux-amd64",
     "~followup_annotations": [
diff --git a/infra/recipes/gn.expected/cipd_exists.json b/infra/recipes/gn.expected/cipd_exists.json
index 9d2811d..0a5dba9 100644
--- a/infra/recipes/gn.expected/cipd_exists.json
+++ b/infra/recipes/gn.expected/cipd_exists.json
@@ -139,6 +139,44 @@
     ]
   },
   {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.read [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "CXXFLAGS = ['-Wall',  '-Wfoo']",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.write [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall',  '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
     "cmd": [],
     "name": "rpmalloc.build rpmalloc-linux-amd64",
     "~followup_annotations": [
diff --git a/infra/recipes/gn.expected/cipd_register.json b/infra/recipes/gn.expected/cipd_register.json
index 425046a..b5e173a 100644
--- a/infra/recipes/gn.expected/cipd_register.json
+++ b/infra/recipes/gn.expected/cipd_register.json
@@ -139,6 +139,44 @@
     ]
   },
   {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.read [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "CXXFLAGS = ['-Wall',  '-Wfoo']",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.write [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall',  '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
     "cmd": [],
     "name": "rpmalloc.build rpmalloc-linux-amd64",
     "~followup_annotations": [
diff --git a/infra/recipes/gn.expected/cq_linux.json b/infra/recipes/gn.expected/cq_linux.json
index 4e32325..daea41e 100644
--- a/infra/recipes/gn.expected/cq_linux.json
+++ b/infra/recipes/gn.expected/cq_linux.json
@@ -166,6 +166,44 @@
     ]
   },
   {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.read [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "CXXFLAGS = ['-Wall',  '-Wfoo']",
+      "[START_DIR]/rpmalloc/build/ninja/clang.py"
+    ],
+    "infra_step": true,
+    "name": "rpmalloc.write [START_DIR]/rpmalloc/build/ninja/clang.py",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@clang.py@CXXFLAGS = ['-Wall',  '-Wfoo']@@@",
+      "@@@STEP_LOG_END@clang.py@@@"
+    ]
+  },
+  {
     "cmd": [],
     "name": "rpmalloc.build rpmalloc-linux-amd64",
     "~followup_annotations": [
diff --git a/infra/recipes/gn.py b/infra/recipes/gn.py
index 6ba79ae..e8fcff1 100644
--- a/infra/recipes/gn.py
+++ b/infra/recipes/gn.py
@@ -198,6 +198,19 @@
               ['git', 'fetch', '--tags', RPMALLOC_GIT_URL, RPMALLOC_REVISION])
           api.step('checkout', ['git', 'checkout', 'FETCH_HEAD'])
 
+        # Patch configure.py since it forces -Weverything which conflicts
+        # with recent Clang rolls. Remove it in-place to work around the issue.
+        # See https://bugs.chromium.org/p/gn/issues/detail?id=278
+        build_ninja_clang_path = api.path.join(rpmalloc_src_dir, 'build/ninja/clang.py')
+        build_ninja_clang_py = api.file.read_text('read %s' % build_ninja_clang_path,
+                                                 build_ninja_clang_path,
+                                                 "CXXFLAGS = ['-Wall', '-Weverything', '-Wfoo']")
+        if '-Weverything' in build_ninja_clang_py:
+          build_ninja_clang_py = build_ninja_clang_py.replace("'-Weverything',", '')
+          api.file.write_text('write %s' % build_ninja_clang_path,
+                              build_ninja_clang_path,
+                              build_ninja_clang_py)
+
         for platform in all_config_platforms:
           # Convert target architecture and os to rpmalloc format.
           rpmalloc_os, rpmalloc_arch = platform.split('-')