Version Control System (VCS), Revision Control or Source Control are software systems used to track changes in files, usually used in software development.

How it works

Usually the files are hosted in a repository (a directory tree for each project). A developer A writes a software system and uses VCS to track the file changes. A developer B wants to add a new feature to the software system or fix a found bug. A common development process goes like this:

• Developer B will want to get the sources in order to work on them


• Developer B works on new features on his copy of the repository


• Developer B commits his work locally


• Developer B completes his job and commits the changes back to the remote (original) repository

Note this is one way of doing things, there can be various ways such as:

• Working a one man project (solo) and keeping the repositories locally.


• Working in a group project with a central remote repository


• Various other flavors

For Bazaar you can check the documentation here and decide what works for you.

Do I Have Bazzar in my System?

You can check if Bazaar is installed in your system by issuing the following in terminal which bzr, if Bazaar is installed you will get: /usr/bin/bzr else you will have to install it with sudo apt-get install bzr

Potential Suspect

From the screenshots you provided it seems that you do not have QT development framework installed in your system (qmake is absent). You can get the Qt framework from the official site or through the Software Center (search for qt-sdk), it will yield the following:

or sudo apt-get install qt-sdk, additionally you can install the documentation.