MPIR library installation on Ubuntu 16.04

Environment: Using Vagrant and Virtual Box

Open the terminal of your host machine.

Create a folder:

mkdir mpir
cd mpir

Initiate vagrant project using ubuntu 16.04 xenial64:

vagrant init ubuntu/xenial64

Vagrant up to spawn the VM

vagrant up --provider virtualbox

Machine starts.

To login into the VM:

vagrant ssh

You will be logged in as ubuntu user.

To resynchronize the package index files from its sources:

sudo apt-get update

Install these prerequisites before compiling:

sudo apt-get install yasm m4 build-essential unzip wget -y

Download the mpir library:

wget http://mpir.org/mpir-3.0.0-alpha2.zip

Unzip the downloaded zipped file:

unzip mpir-3.0.0-alpha2.zip

Change directory to mpir-3.0.0

cd mpir-3.0.0/

Run the following commands:

./configure

make

make check

Once the above commands are successful, run:

sudo make install

MPIR produces libraries named libmpir, etc. under /usr/local/lib,  and the header file mpir.h under /usr/local/include

Create a soft link or set the variable to find mpir library which is not on a standard location:

sudo ln -s /usr/local/lib/libmpir.so.23 /usr/lib/

OR

export LD_LIBRARY_PATH=/usr/local/lib/

To test library is working, copy paste the code snippet 

/*Program to check the Working of mpir library */

#include<mpir.h>
#include<stdio.h>
#include<iostream>

using namespace std;

int main()
{
 mpf_t a;         //mpir float variable
 mpf_init(a);     //initialise a
 mpir_ui two = 2; //mpir unsigned integer variable
 FILE* stream;    //file type pointer to output on standard output (console)
 mpf_init_set_ui (a, 2);          //set value of a to 2
 mpf_out_str (stream, 10, 2, a); //output value of a
 cout << "\nMPIR working" << "\n" ;
}

and run:

g++ test.cpp -lmpir -o test

./test