Linking Opencv libraries in C - c

Question

I've been attempting to write test a simple program using the opencv library. I have the following test code I found on a tutorial. I am running OSX 10.9.2 and managed (I think) to successfully install opencv on my computer using homebrew. My problem is that I cannot get this code to compile because my make file throws errors anytime I try to compile. I believe the issue is that I have not properly linked the libraries, and no amount of googling seems to have helped me solve my problem.
////////////////////////////////////////////////////////////////////////
//
// This is a simple, introductory OpenCV program. The program reads an
// image from a file, inverts it, and displays the result.
//
////////////////////////////////////////////////////////////////////////
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <cv.h>
#include <highgui.h>
int main(int argc, char** argv)
{
IplImage* img = cvLoadImage( "Conumdrum.jpeg", 0 ); //change the name (image.jpg) according to your Image filename.
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage("Example1", img);
cvWaitKey(0);
cvReleaseImage( &img );
cvDestroyWindow( "Example1" );
return 0;
}
I found a sample makefile online that I've attempted to modify but to no avail, here is my makefile below:
# define the C compiler to use
CC = gcc
# define any compile-time flags
CFLAGS = -Wall -g
# define any directories containing header files other than /usr/include
#
INCLUDES = -I/Users/MY_NAME/Projects/Tank\ Game/Webcam_Tests/Webcam_Test_v1/include
# define library paths in addition to /usr/lib
# if I wanted to include libraries not in /usr/lib I'd specify
# their path using -Lpath, something like:
LFLAGS = -L/Users/MY_NAME/Projects/Tank\ Game/Webcam_Tests/Webcam_Test_v1/lib
# define any libraries to link into executable:
# if I want to link in libraries (libx.so or libx.a) I use the -llibname
# option, something like (this will link in libmylib.so and libm.so:
LIBS = -l libopencv_core.dylib -lm
# define the C source files
SRCS = Webcam_Test_v1.c
# define the C object files
#
# This uses Suffix Replacement within a macro:
# $(name:string1=string2)
# For each word in 'name' replace 'string1' with 'string2'
# Below we are replacing the suffix .c of all words in the macro SRCS
# with the .o suffix
#
OBJS = $(SRCS:.c=.o)
# define the executable file
MAIN = mycc
#
# The following part of the makefile is generic; it can be used to
# build any executable just by changing the definitions above and by
# deleting dependencies appended to the file from 'make depend'
#
.PHONY: depend clean
all: $(MAIN)
#echo Simple compiler named mycc has been compiled
$(MAIN): $(OBJS)
$(CC) $(CFLAGS) $(INCLUDES) -o $(MAIN) $(OBJS) $(LFLAGS) $(LIBS)
# this is a suffix replacement rule for building .o's from .c's
# it uses automatic variables $<: the name of the prerequisite of
# the rule(a .c file) and $#: the name of the target of the rule (a .o file)
# (see the gnu make manual section about automatic variables)
.c.o:
$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $#
clean:
$(RM) *.o *~ $(MAIN)
depend: $(SRCS)
makedepend $(INCLUDES) $^
# DO NOT DELETE THIS LINE -- make depend needs it
Terminal gives me the following output when I try to compile:
gcc -Wall -g -I/Users/MY_NAME/Projects/Tank\ Game/Webcam_Tests/Webcam_Test_v1/include -c Webcam_Test_v1.c -o Webcam_Test_v1.o
gcc -Wall -g -I/Users/MY_NAME/Projects/Tank\ Game/Webcam_Tests/Webcam_Test_v1/include -o mycc Webcam_Test_v1.o -L/Users/MY_NAME/Projects/Tank\ Game/Webcam_Tests/Webcam_Test_v1/lib -l libopencv_core.dylib -lm
ld: library not found for -llibopencv_core.dylib
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mycc] Error
Any help would be much appreciated, I've been beating my head against a wall for a couple of days now trying to solve this issue. It should also be noted that I am a novice, especially when it comes to makefiles. Thanks.

Answer 1

Your linker option is wrong. Try with -lopencv_core instead of -l libopencv_core.dylib.
For example, if you want to link a library which filename is libfoo.dylib, the right linker option is -lfoo.
And you will need to add -lopencv_highgui too.