It is only my experience as normal user. It was not that easy to compile Wine 64 on a Debian multiarch system because of the package dependencies between 32 and 64 bit. The only solution to compile the 32 bit part for Wine on a Debian multiarch system was to create a 32 bit schroot jail. For me as user it was more like using 2 systems to compile one an the same package. Maybe they have fixed stuff in 7.6 but for me it was one of the reasons to install Archlinux.
