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i want to compile opencv4.0 with Makefile but undefined reference error occur.
i have used to opencv in Windows and code is just simple code that only show image for test in ubuntu18.10.

but it work if i typing line below on shell.

g++ -o simple main.cpp $(pkg-config opencv4 --libs --cflags)

my Makefile is below

CC = g++                                                                                             
CFLAGS = -W -Wall
SRCS = main.cpp
TARGET = simple

OPENCV = $(pkg-config opencv4 --libs --cflags)

$(CC) $(CFLAGS) -o $(TARGET) $(SRCS) $(LIBS)

    rm -f $(OBJECTS) $(TARGET) core

and my opencv4.pc is below.

# Package Information for pkg-config                                                                 


Name: OpenCV
Description: Open Source Computer Vision Library
Version: 4.0.0
Libs: -L${exec_prefix}/lib -lopencv_gapi -lopencv_stitching -lopencv_aruco -lopencv_bgsegm -lopencv_b
Libs.private: -ldl -lm -lpthread -lrt -L/usr/lib/x86_64-linux-gnu -lGL -lGLU
Cflags: -I${includedir}

and error is below.

g++ -W -Wall -o simple main.cpp 
/usr/bin/ld: /tmp/cciHsvhP.o: in function `main':
main.cpp:(.text+0x70): undefined reference to `cv::imread(cv::String const&, int)'
/usr/bin/ld: main.cpp:(.text+0xc4): undefined reference to `cv::imshow(cv::String const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
make: *** [Makefile:11: simple] Error 1

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