binonly=0
 sbuild_args=
+sbuild_args_sourceful=
 schangesfile=
 arch=
 for opt in "$@"; do
   esac
 done
 
-[ "$binonly" = 0 ] && sbuild_args="${sbuild_args:+$sbuild_args }--source --arch-all"
+rm $schangesfile
+unset schangesfile
 
-sbuild $sbuild_args --arch="$arch" --dist="$dist" --keyid=$KEYID \
-  "$dscfile_basename"
+if [ "$binonly" = 0 ]; then
+  sbuild_args_sourceful="--source --arch-all"
+fi
+
+if [ "$arch" = all ]; then
+  arch="$(schroot -l | sed -rne 's,^sid-([^-]+).*,\1,p' | uniq | tr '\n' ' ')"
+fi
+
+for a in $arch; do
+  echo "I: building $packagenameversion for $a/$dist…" >&2
+
+  sbuild $sbuild_args $sbuild_args_sourceful \
+    --arch="$a" --dist="$dist" --keyid=$KEYID \
+    "$dscfile_basename"
+
+  changesfile="${packagenameversion}_${a}.changes"
+
+  if [ -n "$sbuild_args_sourceful" ]; then
+    schangesfile="${packagenameversion}_source+${changesfile#${packagenameversion}_}"
+    mv "$changesfile" "$schangesfile"
+    changesfile="$schangesfile"
+  fi
 
-changesfile="${packagenameversion}_${arch}.changes"
+  # subsequent iterations should be binonly
+  sbuild_args_sourceful=
 
-postbuild "$changesfile"
+  echo "I: running post-build hook ($packagenameversion/$a/$dist)…" >&2
+  postbuild "$dist" "$a" "$changesfile"
+  echo "I: running dinstall ($packagenameversion/$a/$dist)…" >&2
+  dinstall "$dist" "$changesfile"
 
-dinstall "$dist" "$changesfile"
+  echo "I: done building $packagenameversion for $a/$dist" >&2
+done
+
+if [ -n "${schangesfile:-}" ]; then
+  sarch="${schangesfile##*_}"; sarch=${sarch%.changes}
+  combined_arch="$(echo -n "${sarch}+";
+                   for i in *.changes; do
+                     [ "$i" = "$schangesfile" ] && continue
+                     t="${i##*_}"; echo "${t%.changes}"
+                   done)"
+
+  if [ -n "$combined_arch" ]; then
+    mergechanges *.changes > ${packagenameversion}_${combined_arch}.changes
+    arch="$combined_arch"
+  fi
+fi
 
 DATESTR="$(date +%Y.%m.%d.%H%M%S)"
 BUILD_PREFIX="${packagenameversion}_${arch}.${DATESTR}"
 bundle="${BUNDLE_DIR}/${BUILD_PREFIX}".bundle.tar
 tar -chf "$bundle" *
 chmod 644 "$bundle"
+print_bundle_location "$bundle"
 
-cleanup
 
-print_bundle_location "$bundle"
+cleanup
 
 exit 0