compile error on macos

[zhixun25]

Hello, I encountered the following error when compiling on macos big sur.

/Users/opt/anaconda3/envs/ROS/include/eigen3/Eigen/src/Core/arch/Default/BFloat16.h:478:11: error: reference to unresolved using declaration
return (isinf)(float(a));
^
/Users/opt/anaconda3/envs/ROS/bin/../include/c++/v1/cmath:324:1: note: using declaration annotated with 'using_if_exists' here
using ::isinf _LIBCPP_USING_IF_EXISTS;

Could you please tell me how to solve it?