clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations time/TIME_UTC.c -o time/TIME_UTC -D_POSIX_C_SOURCE=202405L  -lm  -lintl
time/TIME_UTC.c:3:2: error: "TIME_UTC is not defined"
#error "TIME_UTC is not defined"
 ^
1 error generated.