Most things can manufactured most places, with varying degrees of difficulty. A key factor is where you start. My lists were where you start, in each environment. Starting at Earth-normal pressure, Earth-normal temperature, and Earth-normal gravity is advantageous, vs starting with none of those things. Venus has them, Mars manifestly does not.

But even in ideal circumstances, manufacturing Earth-normal gravity on Mars will not be possible.

While I tend to agree with the idea of colonizing a planet as similar as Earth as possible, I also think the barrenness of Mars actually simplifies logistics.

On Venus, you have to deal with high temperatures, acid rain, the bigger gravity well, and the ever-present danger of your floating city falling down. On Mars there's a lot less of everything, but ruling out a meteor, the things you have to deal with are gentler. Not even a dust storm would kill you if it caught you outside in your spacesuit, as it would feel like a breeze.

http://www.mars-one.com/faq/mission-to-mars/what-are-the-ris...