Hi. I am quite sure that neither libgtkada nor libgnacoll directly depends on libfribidi.
As far as I understand, * pango depends on fribidi and this dependency was not reflected for -dev packages. Some dependency was previously hiding the problem by installing libfribidi-dev for other reasons. (Investigating which dependency would not bring much). * Someone noticed this (probably because the dependency does not install fribidi anymore). The gtkada tests currently fail in the testing distribution because of this bug in libpango-dev. * This bug has been fixed in unstable two weeks ago by making libpango-dev depend on libfribidi-dev. If this is correct, I suggest that we close both 896950 and 896951.