cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations time/daylight.c -o time/daylight -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
time/daylight.c:8:13: error: ‘daylight’ undeclared here (not in a function)
    8 | int *foo = &daylight;
      |             ^~~~~~~~