cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/exp2l.c -o math/exp2l -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
math/exp2l.c:5:35: error: ‘exp2l’ undeclared here (not in a function); did you mean ‘exp2f’?
    5 | long double (*foo)(long double) = exp2l;
      |                                   ^~~~~
      |                                   exp2f