cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/atanhl.c -o math/atanhl -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
math/atanhl.c:5:35: error: ‘atanhl’ undeclared here (not in a function); did you mean ‘atanhf’?
    5 | long double (*foo)(long double) = atanhl;
      |                                   ^~~~~~
      |                                   atanhf