Eroare de compilare: user.c: In function ‘main’: user.c:25:2: warning: implicit declaration of function ‘lseek’ [-Wimplicit-function-declaration] lseek(f, 0, SEEK_SET); ^ user.c:29:3: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration] read(f, cN + i, 1); ^ user.c:90:3: warning: implicit declaration of function ‘itoa’ [-Wimplicit-function-declaration] itoa(Nr[i], cN, 10); ^ user.c:92:3: warning: implicit declaration of function ‘write’ [-Wimplicit-function-declaration] write(g, cN, strlen(cN)); ^ /tmp/ccnRYTDr.o: In function `main': user.c:(.text.startup+0x33b): undefined reference to `itoa' collect2: error: ld returned 1 exit status