From 82dc935a50874e899380f32a9a35b7cc4f76df87 Mon Sep 17 00:00:00 2001
From: Todd Gamblin <tgamblin@llnl.gov>
Date: Sun, 15 Feb 2015 01:49:50 -0800
Subject: [PATCH] installed_extensions_for no longer fails when nothing known
 about pkg

---
 lib/spack/spack/packages.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/spack/spack/packages.py b/lib/spack/spack/packages.py
index 7ef8135c1a..3c81863c11 100644
--- a/lib/spack/spack/packages.py
+++ b/lib/spack/spack/packages.py
@@ -119,8 +119,15 @@ def extensions_for(self, extendee_spec):
 
     @_autospec
     def installed_extensions_for(self, extendee_spec):
-        return [s.package for s in self.installed_package_specs()
-                if s.package.extends(extendee_spec)]
+        for s in self.installed_package_specs():
+            try:
+                if s.package.extends(extendee_spec):
+                    yield s.package
+            except UnknownPackageError, e:
+                # Skip packages we know nothing about
+                continue
+                # TODO: add some conditional way to do this instead of
+                # catching exceptions.
 
 
     def dirname_for_package_name(self, pkg_name):
-- 
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