cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/ucontext_t-uc_link.c -o signal/ucontext_t-uc_link -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
signal/ucontext_t-uc_link.c:4:27: error: no member named 'uc_link' in 'struct sigcontext'
        ucontext_t **qux = &bar->uc_link;
                            ~~~  ^
1 error generated.