error : ../include/tap-ctl.h:40:21: fatal error: xen/xen.h: No such file or directory

I compile xen with cenos 7.2  then has some error ( fatal error: xen/xen.h: No such file or directory),I can download  source code of xen, or I can download rpm of xen to solve it?   but I don't know xen version,can you help me？ 