cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations poll/sigset_t.c -o poll/sigset_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
poll/sigset_t.c:2:1: error: unknown type name 'sigset_t'
    2 | sigset_t* foo;
      | ^
1 error generated.