3 gcc
`pkg-config --cflags opencv dbus-glib-1` -o hello-world hello-world.
cpp `pkg-config --libs dbus-glib-1 opencv`
6 gcc
`pkg-config --cflags dbus-glib-1` -o dbushello dbushello.c
`pkg-config --libs dbus-glib-1`
10 .
/hello-world
/usr
/share
/opencv
/haarcascades
/haarcascade_frontalface_alt.xml
13 rm -rf hello-world
tags dbushello