--- Ft/Lib/DistExt/Version.py
+++ Ft/Lib/DistExt/Version.py
@@ -1,4 +1,5 @@
 import re
+import warnings
 from distutils.version import Version, StrictVersion
 
 __all__ = ['CommonVersion', 'VersionPredicate', 'SplitProvision',
@@ -40,6 +41,7 @@
     def parse(self, vstring):
         # save the original string for use by __str__
         self._original = vstring
+        vstring = vstring.rstrip('+')
 
         def versiontuple(vstring):
             """
@@ -53,9 +55,12 @@
 
         # Get the version number
         match = self.version_re.match(vstring)
-        if not match:
-            raise ValueError("invalid version number: %r" % vstring)
-        self.version = versiontuple(match.group())
+        if match:
+            self.version = versiontuple(match.group())
+        else:
+            warnings.filterwarnings("always", "invalid version number: .*, treating it as '0'", Warning)
+            warnings.warn("invalid version number: %r, treating it as '0'" % vstring, Warning)
+            self.version = (0,)
 
         # Check for pre- and post-release tags
         tags = []
@@ -64,7 +69,9 @@
         while start < end:
             match = self.tag_re.match(vstring, start)
             if not match:
-                raise ValueError("invalid release tag: %r" % vstring[start:])
+                warnings.filterwarnings("always", "invalid release tag: .*, ignoring it", Warning)
+                warnings.warn("invalid release tag: %r, ignoring it" % vstring[start:], Warning)
+                break
             tag, version = match.groups()
             tag = tag and tag.lower()
             if tag in self.tag_aliases: