Enabling/installing GD extension? --without-gd

Question

How does one enable (or perhaps I need to install) GD when my phpinfo() output in \"Configure Command\" says; --without-gd ?

I also have nothing in my phpinfo() outp

Answer 1

All previous answers are correct but were not sufficient for me on ArchLinux. I also needed to edit /etc/php/php.ini and to uncomment :

;extension=gd.so 

The initial ; on the line needs to be removed. After restarting Nginx via systemctl restart nginx, I was good to go.