diff -Nru germinate-2.24/debian/changelog germinate-2.25/debian/changelog
--- germinate-2.24/debian/changelog	2016-04-14 21:45:08.000000000 +0000
+++ germinate-2.25/debian/changelog	2016-04-19 09:14:17.000000000 +0000
@@ -1,3 +1,10 @@
+germinate (2.25) unstable; urgency=medium
+
+  * Cope with malformed Built-Using fields, since we only started checking
+    these recently and so older series have some errors.
+
+ -- Colin Watson <cjwatson@ubuntu.com>  Tue, 19 Apr 2016 10:12:03 +0100
+
 germinate (2.24) unstable; urgency=medium
 
   [ Dimitri John Ledkov ]
diff -Nru germinate-2.24/germinate/germinator.py germinate-2.25/germinate/germinator.py
--- germinate-2.24/germinate/germinator.py	2016-04-07 13:28:52.000000000 +0000
+++ germinate-2.25/germinate/germinator.py	2016-04-19 09:01:43.000000000 +0000
@@ -452,7 +452,14 @@
 
         for field in "Pre-Depends", "Depends", "Recommends", "Built-Using":
             value = section.get(field, "")
-            self._packages[pkg][field] = self._parse_depends(value)
+            try:
+                self._packages[pkg][field] = self._parse_depends(value)
+            except ValueError:
+                if field == "Built-Using":
+                    _logger.error(
+                        "Package %s has invalid Built-Using: %s", pkg, value)
+                else:
+                    raise
 
         for field in "Size", "Installed-Size":
             value = section.get(field, "0")