cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations dirent/struct-posix_dent.c -o dirent/struct-posix_dent -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
dirent/struct-posix_dent.c:2:19: error: tentative definition has type 'struct posix_dent' that is never completed
struct posix_dent foo;
                  ^
dirent/struct-posix_dent.c:2:8: note: forward declaration of 'struct posix_dent'
struct posix_dent foo;
       ^
1 error generated.