Just failed my wd os yesterday, and I refresh it with latest one again. I am keeping an eye on who can teach how to build one in v4. I don’t want to downgrade to 3 because vulnerability as you know found in last Oct though not a big deal for me.
In Jessie binutils now support “Large page size” up to 64kb, so - some software can work in v04.x fw.
But… For be sure I strongly recommend to use chroot.
If you try install/upgrade/delete something in system - it can wipe “wd-nas” package and almost all system (Because this package have in dependencies almost all packages in system…). DO NOT USE APT IN SYSTEM! Use chroot instead.
Thanks buddy, as a newbie, I just finished compiling of ARM transmission 2.9 in Ubuntu 14.04 for WD. your suggestion is useful, I will keep it in my mind.