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