macOS (Mojave) build instructions
I tried to build xmrig-proxy for macOS 10.13 and 10.14 but make exits with an error. Here is what I did:

1. cmake .. -DWITH_HTTPD=OFF
2. make

cmake runs without errors or warnings but make exits with following:

[  1%] Building CXX object CMakeFiles/xmrig-proxy.dir/src/App.cpp.o
In file included from /Users/user/xmrig-proxy/src/App.cpp:25:
/Library/Developer/CommandLineTools/usr/include/c++/v1/stdio.h:108:15: fatal error: 
      'stdio.h' file not found
#include_next <stdio.h>
              ^~~~~~~~~
1 error generated.
make[2]: *** [CMakeFiles/xmrig-proxy.dir/src/App.cpp.o] Error 1
make[1]: *** [CMakeFiles/xmrig-proxy.dir/all] Error 2
make: *** [all] Error 2

Any ideas?