$ sudo apt-get update
$ sudo apt-get install libghc-case-insensitive-dev 

libghc-case-insensitive-dev is installed in your system.

Make ensure the libghc-case-insensitive-dev package were installed using the commands given below,

$ sudo dpkg-query -l | grep libghc-case-insensitive-dev *

You will get with libghc-case-insensitive-dev package name, version, architecture and description in a table

libghc-case-insensitive-dev package basic information: