# Revision history [back]

It shouldn't be very difficult. The real "magic" is in the makefile to compile your own code. Linking path and include paths have to be specified as per the opencv version you want.

For example : You have opencv 2.4.9 installed in /path/to/opencv2.4.9/lib/ and opencv 3.0.0 install in /path/to/opencv3.0.0/lib/ as per mentioned in that link, you will have makefile as per below:

Makefile for opencv 2.4.9

 CPP = g++

# OpenCV 2.4.9
CPPFLAGS = -L/path/to/opencv2.4.9/lib \
-I/path/to/opencv2.4.9/include

all: test

test: main.cpp
$(CPP)$(CPPFLAGS) $^ -o [email protected]  and Makefile for opencv 3.0.0  CPP = g++ # OpenCV 2.4.9 CPPFLAGS = -L/path/to/opencv3.0.0/lib \ -I/path/to/opencv3.0.0/include all: test test: main.cpp$(CPP) $(CPPFLAGS)$^ -o [email protected]


You might be confused as in that link, there are two CPPFLAGS defined in the same file.

It shouldn't be very difficult. The You should have different paths while "cmaking" it. For example, you should specify different install paths using -DCMAKE_INSTALL_PREFIX= flag.

For example,

for opencv 2.4.9,

-DCMAKE_INSTALL_PREFIX=/path/to/opencv2.4.9/

while

for opencv 3.0.0

-DCMAKE_INSTALL_PREFIX=/path/to/opencv3.0.0

Do not confuse this path with source path.

And then real "magic" is in the makefile to compile your own code. Linking path and include paths have to be specified as per the opencv version you want.

For example : You have opencv 2.4.9 installed in /path/to/opencv2.4.9/lib/ and opencv 3.0.0 install in /path/to/opencv3.0.0/lib/ as per mentioned in that link, you will have makefile as per below:

Makefile for opencv 2.4.9

 CPP = g++

# OpenCV 2.4.9
CPPFLAGS = -L/path/to/opencv2.4.9/lib \
-I/path/to/opencv2.4.9/include

all: test

test: main.cpp
$(CPP)$(CPPFLAGS) $^ -o [email protected]  and Makefile for opencv 3.0.0  CPP = g++ # OpenCV 2.4.9 CPPFLAGS = -L/path/to/opencv3.0.0/lib \ -I/path/to/opencv3.0.0/include all: test test: main.cpp$(CPP) $(CPPFLAGS)$^ -o [email protected]


You might be confused as in that link, there are two CPPFLAGS defined in the same file.