if build fails, print message about which spkgs failed

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/14263">trac #14263</a>.

root repo

Reported by: jhpalmieri

Component: build

CC: leif,, vbraun

Report Upstream: N/A

Authors: John Palmieri

Dependencies: 

Work issues: 

Reviewers: Volker Braun

Merged in: sage-5.9.beta0

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/14263/trac_14263_sage_root.v2.patch">trac_14263_sage_root.v2.patch: root repo</a> by jhpalmieri at 20130314T23:22:56</li></ol>