How to create makefile for compiling multiple programs - makefile

Question

I have some problems with creating makefile. I have tried to compile some files from terminal and found right options for gcc to do this.
But I have some troubles with creating one makefile to do all this tasks.
Here are my commands that work.
gcc -c pstree.c -DHAVE_CONFIG_H -I.
gcc -o hello pstree.o -L/usr/lib/ -ltinfo
gcc -c fuser.c -DHAVE_CONFIG_H -I.
gcc -c -o libsignals.a signals.c
gcc -o hello fuser.o -L/usr/lib/ -L. -lsignals
gcc -c -o libsignals.a signals.c
gcc -o hello killall.o -L/usr/lib/ -L. -lsignals
gcc -c killall.c -DHAVE_CONFIG_H -I.
How can I make a Makefile for executing these commands?

Answer 1

killall: hello\ fuser.o
gcc -c -o libsignals.a signals.c
gcc -o hello killall.o -L/usr/lib/ -L. -lsignals
gcc -c killall.c -DHAVE_CONFIG_H -I.
fuser: hello\ pstree.o
gcc -c fuser.c -DHAVE_CONFIG_H -I.
gcc -c -o libsignals.a signals.c
gcc -o hello\ fuser.o -L/usr/lib/ -L. -lsignals
pstree:
gcc -c pstree.c -DHAVE_CONFIG_H -I.
gcc -o hello\ pstree.o -L/usr/lib/ -ltinfo
clean:
rm -rf *.o
I wrote very very dirty you can define cc variable such as:
CC = gcc
CFLAGS = -g -Wall -I.
LIBS = -L/usr/lib/ -lsignals
and so on.....
Mine is very dirty ....
NOTE: Before each line of intending you have to use TAB, not space.
usage :
make clean
make killall