# MacOS X 10.7.x
# You need opencv is installed (macports)

g++ -ggdb `pkg-config --cflags opencv` `pkg-config --libs opencv` header.cpp header2.cpp program.cpp -o program

# Ubuntu 13.04 / Mint 15
# opencv from source because package version doesn't have nonfree modules separated (SURF/SIFT)
# and you can have problems (install pkg-config too)

g++ -o program program.cpp `pkg-config opencv --cflags --libs`