Hi Michael and Aaron, I committed what you asked for to the git: http://anonscm.debian.org/cgit/debichem/packages/chemps2.git/tree/debian/rules
Only the build directory obj-${...} is changed to obj-${DEB_HOST_GNU_TYPE}, as I gather from e.g. https://packages.debian.org/sid/i386/libhdf5-8/filelist that the installation directory is still /usr/lib/i386-linux-gnu/. Best wishes, Sebastian