https://bugzilla.redhat.com/show_bug.cgi?id=862160
--- Comment #9 from Sebastian Dyroff bugs@dyroff.org --- Created attachment 622075 --> https://bugzilla.redhat.com/attachment.cgi?id=622075&action=edit patch to include unistd.h in vk_utils.cpp
It still did not build for me. I have created a patch that fixes the last build error for me.