clang -O2  -Wall -Wextra -Werror=implicit-function-declaration sys_select/pselect.c -o sys_select/pselect -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
sys_select/pselect.c:52:14: error: implicit declaration of function 'pselect' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        if ( (ret = pselect(max + 1, &read_set, NULL, &error_set, &timeout,
                    ^
sys_select/pselect.c:52:14: note: did you mean 'select'?
/usr/include/sys/select.h:71:5: note: 'select' declared here
int     select(int, fd_set * __restrict, fd_set * __restrict,
        ^
1 error generated.