I had some trouble to get PECL uploadprogress installed using the regular way running $ sudo pecl install uploadprogress

So after some googling I found a solution and it was to do the following:

1. Download the PECL uploadprogress extension

2. extract and jump into the dir

3. Run these commands

sudo phpize
sudo ./configure
sudo make
sudo make install

This was done after following this fine guide, http://tinyurl.com/bsv7gzy