Build errors on Mac OS X Catalina / XCode 11

[rojer]

What OS are you using (uname -a, or Windows version)?

Darwin rojer9-mbp 19.0.0 Darwin Kernel Version 19.0.0: Thu Oct 17 16:17:15 PDT 2019; root:xnu-6153.41.3~29/RELEASE_X86_64 x86_64

XCode 11

What programming language are you using (C/C++/Go/Rust)?

go version go1.13.4 darwin/amd64

What did you expect to see and what you saw instead?

getting build erorrs:

./webview.h:1690:23: error: too many arguments to function call, expected 0, have 3
  return objc_msgSend((id)objc_getClass("NSString"),
         ~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/objc/message.h:62:1: note: 'objc_msgSend' declared here
OBJC_EXPORT void
^