I use Gentoo Linux and I love it however the Portage package manager can be confusing sometimes with all the USE flags and other variables which can be set. Generally the error messages are fairly accurate with instructions however today I ran across a particularly stubborn package that just would not build.
There may come a time when you need to hide some sensitive data and send it in a email. Although there are better ways to do this with GPG keys, the old hide the code in some thing else trick is still a good one. The program we will use for this is called steghide. The source and more information can be found here.