Bug#1104596: rust-libphosh: FTBFS: error[E0425]: cannot find value `PANGO_FONT_MASK_VARIATIONS` in crate `ffi`

[Santiago Vila]

Hi. I'm trying to figure out why there are both failed
and successful builds in the official buildds.

Is it possible that there is a missing build-depends like this?

Build-Depends: rust-pango-0.18 (>= 0.18.3-2)

Thanks.