cc -O2 -pipe  -pthread  -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 -lpthread 
termios/tcsetwinsize.c:41:8: error: call to undeclared function 'tcsetwinsize'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                if ( tcsetwinsize(pty, &ws) < 0 )
                     ^
1 error generated.