“Unable to find remote helper for ‘https'” during git clone

I am unable to clone HTTPS repositories. I can clone SSH repos fine, but not HTTPS repos. I cannot test the GIT protocol since I am behind a corporate firewall.

This is what I am trying to do:

$ git clone https://github.com/nvie/gitflow.git
Cloning into gitflow...
fatal: Unable to find remote helper for 'https'

I have so far tried the following (based on Google searches)

• Purging and installing Git through apt-get
• Installing build-deps for Git through apt-get
• Installing curl dev libraries
• Installing expat libraries
• Downloading Git source and building using:
  • ./configure --prefix=/usr --with-curl --with-expat
  • Also tried pointing configure at curl binary (./configure --prefix=/usr --with-curl=/usr/bin/curl)

I have tried everything I can find on the internet with no luck. Can anyone help me?

Git version = 1.7.6.4

OS = Ubuntu 11.04