catkin_make is not building my bitbucket based ros packages

edit

Background

I have an existing project that I want to migrate to a different computer. I started building a project on my Raspberry Pi and then put the project up on github. The current name of the project/package is zlab_drone. Here is the hierarchy of my project

                                         /home 
                                            |
                                        /catkin_ws
                                            |
     ----------------------------------------------------------------------------------
     |                                      |                                         |
  /devel                                  /src                                     /build
     |                                      |                                         |
    ...                        -----------------------------                         ...
                               |             |             |
                  CMakeLists.txt     /ardrone_autonomy     /zlab_drone

Main Issue

Now my problem is the fact that whenever I clone my /zlab folder into my /src folder on a different computer and run catkin_make in my /catkin_ws folder, it does not build the /zlab_drone package that I have cloned. However, if I build the whole thing from ground up, using catkin_create_package, catkin_make recognizes the package /zlab_drone. In fact, to get ardrone_autonomy, I just git cloned it into my /src folder. Not sure why this isn't working for /zlab_drone.

Solutions that I have tried out

Looking at the CMakeLists.txt present in ardrone_autonomy, I noticed that they had this little section:

# Build [pathced] ardronelib from an external project
include(ExternalProject)
ExternalProject_Add(ardronelib
    GIT_REPOSITORY git://github.com/AutonomyLab/ardronelib.git
    GIT_TAG 2f987029c55531e4c0119c3600f9c57f935851ed
    PREFIX ${CATKIN_DEVEL_PREFIX}
    CONFIGURE_COMMAND echo "No configure"
    BUILD_COMMAND make
    INSTALL_COMMAND make install INSTALL_PREFIX=${CATKIN_DEVEL_PREFIX}/lib/ardrone
    BUILD_IN_SOURCE 1
)

I modified this for the current project that I am looking at:

include(ExternalProject)
ExternalProject_Add(zlab_drone
    GIT_REPOSITORY https://bitbucket.org/sharan_duggirala/zlab_drone
    PREFIX ${CATKIN_DEVEL_PREFIX}
    CONFIGURE_COMMAND echo "No configure"
    BUILD_COMMAND make
    INSTALL_COMMAND make install INSTALL_PREFIX=${CATKIN_DEVEL_PREFIX}/lib/zlab_drone
    BUILD_IN_SOURCE 1
)

Now the problem I face is that whenever I get the prompt for Username for 'https://bitbucket.org' catkin_make continues with Building ARDroneTool/Lib. I am going to try this out with github and check if a similar problem persists. However, I would like to discover a way to use bitbucket, as it allows private projects and such.