Upstream is no longer support autotools and plans to remove it entirely in the future. They strongly advise the use of cmake instead. https://github.com/xbmc/xbmc/pull/10922#issuecomment-264541902 https://github.com/xbmc/xbmc/pull/10429
I don't really know a lot about autotools or cmake, but I'll give it a try :-) Here's my work in progress: https://github.com/gentoo/gentoo/pull/3027 Any help would be greatly appreciated.