The package I keep forgetting I need to install on a new Ubuntu box is libc6-dev.  If you get basic compile errors because stdlib.h cannot be found that will be the one you need.

apt-get install libc6-dev

I should also remember that the subversion package is named subversion not svn.  Not that you don’t get told that when you try to run svn before it’s installed!

apt-get install subversion