* origin/deploy:
etc/sbuild.conf.in: Keep failed build trees for diagnostics.
## Actually resolve alternatives properly.
$resolve_alternatives = 1;
+## Leave debris for diagnostics.
+$purge_build_deps = "successful";
+$purge_build_directory = "successful";
+$purge_session = "successful";
+
## Don't do anything clever if the build dependencies fail. The clever thing
## doesn't work on older distributions. Also, it takes extra time, and
## that's not desirable.