You can install libncurses5-dev package via Software Center or:

sudo apt-get install libncurses5-dev

Also, you can install the package by clicking here.

When you need a file or package and can't find it you can use some tools.

1. apt-file

First, install apt-file and update it.

sudo apt-get install apt-file

apt-file update

You can search with apt-file needed files or packages.

apt-file search curses.h

2. Use packages.ubuntu.com

Go to this link.

On right top, select package contents if your are searching a file included with a package. If you need a package directly, just search it with its name choosing package names.