clang -O2  -Wall -Wextra -Werror=implicit-function-declaration termios/tcgetwinsize.c -o termios/tcgetwinsize -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
termios/tcgetwinsize.c:52:8: error: implicit declaration of function 'tcsetwinsize' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                if ( tcsetwinsize(pty, &ws) < 0 )
                     ^
termios/tcgetwinsize.c:57:8: error: implicit declaration of function 'tcgetwinsize' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                if ( tcgetwinsize(pty, &new_ws) < 0 )
                     ^
termios/tcgetwinsize.c:57:8: note: did you mean 'tcsetwinsize'?
termios/tcgetwinsize.c:52:8: note: 'tcsetwinsize' declared here
                if ( tcsetwinsize(pty, &ws) < 0 )
                     ^
2 errors generated.