The last time I tried to build k2pdfopt, the source zip was missing a bunch of files. You had to download another zip, which wasn't complete either, and combine the results. And then the build failed because cmake was having a bad hair day. I wanted to like it since the windows exe did seem very handy, but had to give up at that point. (Oh, wait, there was a bit more. I did get it building, but the source assumed fprintf(NULL, "log msg") was a perfectly fine thing to do. That's when I gave up.)