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