diff --git a/media/webrtc/trunk/build/mac/find_sdk.py b/media/webrtc/trunk/build/mac/find_sdk.py
index ca58284eac..c26c3763c9 100644
--- a/media/webrtc/trunk/build/mac/find_sdk.py
+++ b/media/webrtc/trunk/build/mac/find_sdk.py
@@ -52,7 +52,7 @@ def main():
       sdk_dir = xcode43_sdk_path
     else:
       sdk_dir = os.path.join(out.rstrip(), 'SDKs')
-    sdks = [re.findall('^MacOSX(10\.\d+)\.sdk$', s) for s in os.listdir(sdk_dir)]
+    sdks = [re.findall('^MacOSX(\d+\.\d+)\.sdk$', s) for s in os.listdir(sdk_dir)]
     sdks = [s[0] for s in sdks if s]  # [['10.5'], ['10.6']] => ['10.5', '10.6']
     sdks = [s for s in sdks  # ['10.5', '10.6'] => ['10.6']
             if parse_version(s) >= parse_version(min_sdk_version)]
diff --git a/media/webrtc/trunk/build/mac/find_sdk_uxp.py b/media/webrtc/trunk/build/mac/find_sdk_uxp.py
index 3c419f1e45..a68e165f1a 100644
--- a/media/webrtc/trunk/build/mac/find_sdk_uxp.py
+++ b/media/webrtc/trunk/build/mac/find_sdk_uxp.py
@@ -19,11 +19,12 @@ if sys.platform == 'darwin':
       print("find_sdk_uxp.py: error: Specified path does not exist or is not a directory")
       sys.exit(1)
 
-  KNOWN_SDK_VERSIONS = ["10.7", "10.8", "10.9", "10.10",
-                        "10.11", "10.12", "10.13", "10.14",
-                        "10.15"]
+  KNOWN_SDK_VERSIONS = ["10.7", "10.8", "10.9", "10.10", "10.11"
+                        "10.12", "10.13", "10.14", "10.15", "10.16",
+                        "11.0", "11.1", "11.2", "11.3",
+                        "12.0"]
 
-  REGEX = "^MacOSX(10\.\d+)\.sdk$"
+  REGEX = "^MacOSX(\d+\.\d+)\.sdk$"
   SDK_VERSION = re.findall(REGEX, os.path.basename(SDK_PATH))
 
   if not SDK_VERSION:
diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm
index 868687fe16..e2aa6729e9 100644
--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -209,6 +209,8 @@ uint32_t nsChildView::sLastInputEventCount = 0;
 + (BOOL)_shouldZoomOnDoubleClick; // present on 10.7 and above
 @end
 
+// This is only possible with SDKs below 10.15
+#ifndef MAC_OS_X_VERSION_10_15
 // Starting with 10.7 the bottom corners of all windows are rounded.
 // Unfortunately, the standard rounding that OS X applies to OpenGL views
 // does not use anti-aliasing and looks very crude. Since we want a smooth,
@@ -226,6 +228,7 @@ uint32_t nsChildView::sLastInputEventCount = 0;
   return region;
 }
 @end
+#endif
 
 #pragma mark -