cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/struct-sigevent-sigev_notify_attributes.c -o signal/struct-sigevent-sigev_notify_attributes -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
signal/struct-sigevent-sigev_notify_attributes.c:2:17: error: declaration of 'struct sigevent' will not be visible outside of this function [-Werror,-Wvisibility]
void foo(struct sigevent* bar)
                ^
signal/struct-sigevent-sigev_notify_attributes.c:4:2: error: use of undeclared identifier 'pthread_attr_t'
        pthread_attr_t **qux = &bar->sigev_notify_attributes;
        ^
signal/struct-sigevent-sigev_notify_attributes.c:4:19: error: use of undeclared identifier 'qux'
        pthread_attr_t **qux = &bar->sigev_notify_attributes;
                         ^
signal/struct-sigevent-sigev_notify_attributes.c:4:29: error: incomplete definition of type 'struct sigevent'
        pthread_attr_t **qux = &bar->sigev_notify_attributes;
                                ~~~^
signal/struct-sigevent-sigev_notify_attributes.c:2:17: note: forward declaration of 'struct sigevent'
void foo(struct sigevent* bar)
                ^
signal/struct-sigevent-sigev_notify_attributes.c:5:9: error: use of undeclared identifier 'qux'
        (void) qux;
               ^
5 errors generated.