--- src/sage/misc/package.py.orig	2014-11-23 15:58:13.000000000 +0100
+++ src/sage/misc/package.py	2015-01-22 20:32:25.651383902 +0100
@@ -194,7 +194,7 @@
         sage: is_package_installed('sage')
         True
     """
-    return any(p.startswith(package) for p in install_package())
+    return True
 
 def standard_packages():
     """