Programming

CC=gcc
LIBS=-lmenu -lncurses
RM=rm

BINS=menu_item_data

%: %.o
    ${CC} -o $@ $< ${LIBS} 

%.o: %.c
    ${CC} -o $@ -c $< 

.PHONY: all clean


all: $(BINS)
    echo "Jeśli nie widzisz błędów to wszystko OKi"

clean:
    ${RM} -f ${BINS}

$ make
gcc     menu_item_data.c   -o menu_item_data
menu_item_data.c: In function 'main':
menu_item_data.c:29: warning: incompatible implicit declaration of built-in function 'calloc'
/tmp/ccsA63dp.o: In function `main':
menu_item_data.c:(.text+0x14): undefined reference to `initscr'
(......)
menu_item_data.c:(.text+0x215): undefined reference to `endwin'
collect2: ld returned 1 exit status
make: *** [menu_item_data] Błąd 1

[marcin@zet c1_menu(0)]$ ls 
makefile  menu_item_data.c
[marcin@zet c1_menu(0)]$ vim m  
makefile          menu_item_data.c  
[marcin@zet c1_menu(0)]$ vim makefile  
[marcin@zet c1_menu(0)]$ gcc -o menu_item_data.o -c menu_item_data.c 
menu_item_data.c: In function 'main':
menu_item_data.c:29: warning: incompatible implicit declaration of built-in function 'calloc'
[marcin@zet c1_menu(0)]$ gcc -o menu_item_data menu_item_data.o -lmenu -lncurses
[marcin@zet c1_menu(0)]$ ls
makefile  menu_item_data  menu_item_data.c  menu_item_data.o
[marcin@zet c1_menu(0)]$

[marcin@zet c1_menu(0)]$ make -f makefile -n
gcc     menu_item_data.c   -o menu_item_data
echo "Jeśli nie widzisz błędów to wszystko OKi"

[marcin@zet c1_menu(0)]$ gcc -o menu_item_data.o -c menu_item_data.c 
menu_item_data.c: In function 'main':
menu_item_data.c:29: warning: incompatible implicit declaration of built-in function 'calloc'