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.
First, install apt-file and update it.
sudo apt-get install apt-file
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.