I want to build an elementary os bluetooth github project on elementary os.  When I run cmake -DCMAKE_INSTALL_PREFIX=/usr .. it starts and checks some things.  Then error: No package 'libnotify' found.  This appears to be some kind of developer package.  How do I install this for elementary os?
Install libnotify development package
elementary os;libnotify
On elementary OS and other Debian-based distributions such as Ubuntu and Linux Mint, the package is libnotify-dev. Generally, to compile a program that uses the XXX library, you need the package called libXXX-dev.You could start a terminal, log in as root (or, in case there is no root account, use sudo -s), and run:apt-get updateapt-get install -y libnotify-devBut there are other ways to install a package, as well.