Specify dependency url in setup.py for modules in PyPI

Question

The questions I've seen here so far deal with the opposite situation, i.e. providing a link to off-PyPI dependencies. In my case, the dependency is published in PyPI, but the version is not up to my requirements. Here is an excerpt from my setup.py

setup(
    ...
    install_requires=["numpy>=1.11.0",
                      "scipy>=0.17.0",
                      "lasagne",
                      "Theano>=0.8.1",
                      "scipy>=0.17.0"],

    dependency_links=["git+https://github.com/Lasagne/Lasagne.git#egg=lasagne"]
)

I need lasagne to be installed from the link, while pip insists on installing the PyPI version.

Edit. I've tried doing this

setup(
    ...
    install_requires=["numpy>=1.11.0",
                      "scipy>=0.17.0",
                      "lasagne>=0.2.dev1",
                      "Theano>=0.8.1",
                      "scipy>=0.17.0"],

    dependency_links=[
        "git+https://github.com/Lasagne/Lasagne.git#egg=lasagne-0.2.dev1"]
)

This results in Could not find a version that satisfies the requirement lasagne>=0.2.dev1

Edit2

Actually passing the --process-dependency-links flag as shown here (thanks to Nehal J. Wani) makes it work. How can I make this flag work by default? I don't want a user to be confused.