Example of makefile

edit

This is my typical CMakeLists.txt for testing code, which also includes several commented lines for Qt and OpenMP, which you can uncomment if needed. Since this is a CMakeLists.txt you need cmake to create the actual Makefile, e.g. via "ccmake ." (where '.' refers to the current location).

project(Test)
cmake_minimum_required(VERSION 2.8)

set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")

include_directories(${CMAKE_CURRENT_SOURCE_DIR})

#if you want to have Qt4-support uncomment this
#find_package(Qt4 REQUIRED)
#if(QT_FOUND)
## activate XML component
#set(QT_USE_QTXML TRUE)
#include(${QT_USE_FILE})
#add_definitions(${QT_DEFINITIONS})
#include_directories(${CMAKE_CURRENT_BINARY_DIR} ${QT_INCLUDE_DIR})
#endif(QT_FOUND)    

find_package( OpenCV REQUIRED )
if( OpenCV_FOUND )
list( APPEND ThirdParty_LIBS ${OpenCV_LIBS} )
    include_directories( ${OpenCV_INCLUDE_DIRS} )
endif( OpenCV_FOUND )

# uncomment this for OpenMP support
#FIND_PACKAGE(OpenMP REQUIRED)  
#if(OPENMP_FOUND)
#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
#set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
#endif()

# uncomment this for c++11 support
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(${PROJECT_NAME}_SRC main.cpp test1.cpp test2.cpp)
set(${PROJECT_NAME}_HDR test1.h test2.h)
# currently we don't have any forms-uncomment if you have qt-forms
#set(${PROJECT_NAME}_FORMS mainwindow.ui)

# also no moc from headers needed (uncomment if qt used)
#QT4_WRAP_CPP(${PROJECT_NAME}_HDR_MOC ${${PROJECT_NAME}_HDR})
# no forms
#QT4_WRAP_UI(${PROJECT_NAME}_FORMS_HDR ${${PROJECT_NAME}_FORMS})

# use this line if you have used Qt instead the next line
#add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SRC} ${${PROJECT_NAME}_HDR_MOC} ${${PROJECT_NAME}_FORMS_HDR} )
add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SRC} ${${PROJECT_NAME}_HDR})
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS})

I have found another old Makefile, which I used with an old OpenCV-version. However, I don't know if OpenCV's pkg-files have been fixed again.

CC=g++
#CFLAGS+=-g
CFLAGS+=`pkg-config --cflags opencv`
LDFLAGS+=`pkg-config --libs opencv`

PROG=opencvtest
OBJS=$(PROG).o

.PHONY: all clean
$(PROG): $(OBJS)
    $(CC) -o $(PROG) $(OBJS) $(LDFLAGS)

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

all: $(PROG)

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

Here the correct flags (i.e. -I -L ) are handled by pkgconfig, i.e. also that you need to set the PKG_CONFIG_PATH to the folder which contains the opencv.pc-file.