It is currently impossible to find a lightweight Djvu viewer for X11. I use FreeBSD. I have a 2GB SSD in my laptop. If a program can't fit, the problem is the bloated program, not the small SSD. If you simply want to view a Djvu file, you can use my little script. It uses only the command line djvu tools and the xv graphics viewer. It works for me. Hack it. Bend it. Twist it. Make it do whatever you want it to do. Rename it. Sell it. Whatever.

krdjvu

Note:This is for hardcore Unix users. If you aren't a hardcore Unix user, it will probably not be of any use to you. Read the code before running it. It is very simple. Run it only if you understand it.