I had recently problems installing nemesis on openSUSE, because nemesis needs an earlier libnet version, which I didn’t find in the OBS (maybe I’ll upload it on my repo, but I have to find out first how the OBS work 
).
I dowloaded the nemesis source from here
If you have libnet 1.1 installed, it will always say, it can’t find the libnet directory.
So I downloaded an libnet 1.02a rpm from here and installed it.
After that you can compile nemesis without any problems.
But while updating you might also update libnet to the higher version and after that it might not work anymore.
