My First Makefile

[Makefile]
# Makefile Test
include FileList
CC = gcc
CFG = release
OBJS = $(addsuffix .o, $(basename $(SOURCE)))
EXE = hello

# release
CFLAGS_RELEASE = -O2
DFLAGS_RELEASE = LINUX OS_POSIX

# debug
CFLAGS_DEBUG =
DFLAGS_DEBUG = _DEBUG LINUX OS_POSIX

# switch CFG
ifeq ($(CFG), release)
CFLAGS = $(CFLAGS_RELEASE)
DFLAGS = $(addprefix -D, $(DFLAGS_RELEASE))
else
CFLAGS = $(CFLAGS_DEBUG)
DFLAGS = $(addprefix -D, $(DFLAGS_DEBUG))
endif

# make rules
all: $(EXE)

$(EXE): $(OBJS)
$(CC) $(CFLAGS) -o $@ $^

%.o: %.c
$(CC) $(CFLAGS) $(DFLAGS) -c $<

clean:
rm -f $(EXE) $(OBJS)

[filelist.sh]
#!/bin/sh
FileList=`find -name '*.c'`

echo "SOURCE =" '\'
for i in $FileList; do
echo $i '\'
done
echo