how to specify obj and bin directories in GNUmake - gnu-make

Question

I have a following directory structure,
I also have this make file that works fine, but it needs all files in the same directory and also it creates *.o and bin files in the same directory. Can someone please show me how to improve this code so that i can move *.h files into /h, *.c files into /src. Also *.o files would be created in /obj and the binary file will be created in /bin?
I was thinking of something like this. This part only creates *.o files, no binary files. However, this is giving me an error right now.

Answer 1

Step 1: h/
Add a variable, make a small change to the %.o rule, and add a vpath directive, so that the %.o rule will know where to look:
INC_DIR = h
%.o: %.c
$(cc) -I$(INC_DIR) -c $<
vpath %.h $(INC_DIR)
Step 2: src/
Add another variable, change the assignment of objs, add another vpath:
SRC_DIR := src
objs:=$(patsubst $(SRC_DIR)/%.c,%.o,$(wildcard $(SRC_DIR)/*.c))
vpath %.c $(SRC_DIR)
Step 3: obj/
Add a variable, change objs and the %.o rule again, and the clean rule:
OBJ_DIR = obj
objs:=$(patsubst $(SRC_DIR)/%.c,$(OBJ_DIR)/%.o,$(wildcard $(SRC_DIR)/*.c))
$(OBJ_DIR)/%.o: %.c
$(cc) -Ih -c $< -o $#
clean:
rm -f *.d $(OBJ_DIR)/*.o $(prog)
Step 4: bin/
Add another variable, and change the assignment of prog:
BIN_DIR := bin
prog:=$(BIN_DIR)/$(notdir $(PWD))
EDIT:
What you are now asking for is a bad design. But here it is:
obj/makefile:
SRC_DIR := ../src
objs:=$(patsubst $(SRC_DIR)/%.c,%.o,$(wildcard $(SRC_DIR)/*.c))
cc:=gcc
.PHONY: ALL_OBJS
ALL_OBJS: $(objs)
INC_DIR := ../h
%.o: %.c
$(cc) -I$(INC_DIR) -c $<
vpath %.c $(SRC_DIR)
.PHONY: clean test
clean:
rm -f *.[od]
-include *.d
bin/makefile:
P:= $(PWD)
P:= $(dir $(P))
prog:= $(notdir $(P:/=))
OBJ_DIR := ../obj
objs:=$(notdir $(wildcard $(OBJ_DIR)/*.o))
cc:=gcc
ccflags:=-lcurses -lgdbm -lgdbm_compat
$(prog): $(objs)
$(cc) $(ccflags) -o $# $^
vpath %.o $(OBJ_DIR)
.PHONY: clean test
clean:
rm -f *.d $(prog)
test: $(prog)
$(test)
-include *.d