$ sudo apt-get update
$ sudo apt-get install libghc-weighted-regexp-dev 

libghc-weighted-regexp-dev is installed in your system.

Make ensure the libghc-weighted-regexp-dev package were installed using the commands given below,

$ sudo dpkg-query -l | grep libghc-weighted-regexp-dev *

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

libghc-weighted-regexp-dev package basic information: