clang -O2  -Wall -Wextra -Werror=implicit-function-declaration termios/tcsetwinsize.c -o termios/tcsetwinsize -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
termios/tcsetwinsize.c:41:8: error: implicit declaration of function 'tcsetwinsize' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                if ( tcsetwinsize(pty, &ws) < 0 )
                     ^
1 error generated.