Something

gcc -Os -Wall  -c evdev_2_nubers.c
evdev_2_nubers.c: In function `beginn_translation':
evdev_2_nubers.c:140: warning: implicit declaration of function `read'
gcc -Os -Wall  -c keyevents_2_uinput.c
keyevents_2_uinput.c: In function `dev_uinput_init':
keyevents_2_uinput.c:37: warning: implicit declaration of function `memset'
keyevents_2_uinput.c:38: warning: implicit declaration of function `strncpy'
keyevents_2_uinput.c:41: warning: implicit declaration of function `write'
keyevents_2_uinput.c:43: warning: implicit declaration of function `close'
gcc -Os -Wall  -c number_2_keyevents.c
gcc -Os -Wall  -c main.c
main.c: In function `main':
main.c:102: warning: implicit declaration of function `close'
gcc -Os -Wall  -o thumb2key evdev_2_nubers.o keyevents_2_uinput.o number_2_keyevents.o main.o