cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/M_El.c -o math/M_El -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
math/M_El.c:8:26: error: 'M_El' undeclared here (not in a function); did you mean 'M_E'?
    8 | long double  const foo = M_El;
      |                          ^~~~
      |                          M_E