Found another option to f.lux, apart from redshift. It is called Iris and you can install it or you can download the micro version which is the one I am using. It is a portable very little executable with a couple of scripts (day mode and night mode), and you can also create your own very easily.

Would really appreciate f.lux on fedora. I am having the same issue, cannot install on Fedora 23

@herf Is there something new? I really miss this feature too.