In ArcGIS there is a tool called Resolve Building Conflicts and I'd like to achieve the same using only open source tools (QGIS, GDAL etc), preferably on Mac OS instead.
In the long run I'm trying to do exactly what Anna Vetter tries to do in her thesis called The automatic generalisation of buildings whilst maintaining the settlement structure: A case study based on the 1:50‘000 Swiss National Map Series but without using ESRI.
I've also seen this discussion about buildings.
Any ideas?