cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations time/struct-itimerspec.c -o time/struct-itimerspec -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
time/struct-itimerspec.c:2:19: error: tentative definition has type 'struct itimerspec' that is never completed
    2 | struct itimerspec foo;
      |                   ^
time/struct-itimerspec.c:2:8: note: forward declaration of 'struct itimerspec'
    2 | struct itimerspec foo;
      |        ^
1 error generated.