Apply workaround on += bug.

software/vifib/software.cfg

@@ -26,7 +26,9 @@ command = ${git:location}/bin/git clone --quiet -b ${:branch} ${:repository} ${:
 update-command = cd ${:location} && ${git:location}/bin/git pull --quiet && if [ -n ${:revision} ]; then cd ${:location} && ${git:location}/bin/git reset --quiet --hard ${:revision} ; fi
 
 [local-bt5-repository]
-list += ${vifib:location}/master/bt5
+# XXX: workaround for zc.buildout bug, as list += ends up with adding new entry
+#      after newline
+list = ${erp5:location}/bt5 ${erp5:location}/product/ERP5/bootstrap ${vifib:location}/master/bt5
 
 [products]
 # XXX: Lack of eggification workaround