Building issue (movian-git)

[l4l]

So I'm making a package (based on https://github.com/andoma/movian). After testing the package via makepkg/namcap it suddenly failed to build via yaourt.

I guess there may be some vars name intersection or something like that. First issue appears here, based on error $PLATFORM was undefined.
if i manually define $PLATFORM issue occurs even earlier, undefined $BUILDDIR.
Well, if i define $BUILDDIR (as "build.$PLATFORM") after that there's more weirder error:

make: *** No rule to make target '/tmp/yaourt-tmp-kitsu/aur-movian-git/src/movian/build.linux/stamps/libav.stamp', needed by 'build.linux//ext/duktape/duktape.o'.