diff -Nru mia-2.4.6/debian/changelog mia-2.4.6/debian/changelog
--- mia-2.4.6/debian/changelog	2019-10-23 09:00:04.000000000 +0000
+++ mia-2.4.6/debian/changelog	2019-11-16 05:49:21.000000000 +0000
@@ -1,3 +1,16 @@
+mia (2.4.6-5+rpi2) bullseye-staging; urgency=medium
+
+  * sourceful rebuild to work around migrator issue.
+  * Add build-conflicts on python2.7-minimal.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Sat, 16 Nov 2019 05:49:21 +0000
+
+mia (2.4.6-5+rpi1) bullseye-staging; urgency=medium
+
+  * Build with gcc/g++ 8 to hopefully avoid strange c++ error.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Tue, 29 Oct 2019 13:25:09 +0000
+
 mia (2.4.6-5) unstable; urgency=medium
 
   [ Jelmer Vernooij ]
diff -Nru mia-2.4.6/debian/control mia-2.4.6/debian/control
--- mia-2.4.6/debian/control	2019-10-23 09:00:04.000000000 +0000
+++ mia-2.4.6/debian/control	2019-11-16 05:49:21.000000000 +0000
@@ -26,13 +26,16 @@
                libvtk7-dev,
                libvistaio-dev,
                libxml2-dev,
-               python3-lxml
+               python3-lxml,
+               gcc-8,
+               g++-8
 Build-Depends-Indep: docbook-xsl,
                      doxygen,
                      graphviz,
                      libjs-mathjax,
                      xsltproc
 Standards-Version: 4.3.0
+Build-Conflicts: python2.7-minimal
 Vcs-Browser: https://salsa.debian.org/med-team/mia
 Vcs-Git: https://salsa.debian.org/med-team/mia.git
 Homepage: http://mia.sourceforge.net
diff -Nru mia-2.4.6/debian/rules mia-2.4.6/debian/rules
--- mia-2.4.6/debian/rules	2019-10-23 09:00:04.000000000 +0000
+++ mia-2.4.6/debian/rules	2019-10-29 13:24:40.000000000 +0000
@@ -17,6 +17,8 @@
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
+export CC=gcc-8
+export CXX=g++-8
 
 # deduce documentation option (build-indep target)
 ifeq "" "$(filter %-doc,$(shell dh_listpackages))"