gfan 0.4plus [p1] fails to build with GCC 4.7.0

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12760">trac #12760</a>.

Diff between my p2 and my p3 spkg.  For reference / review only.

Reported by: leif

Component: packages

CC: mhampton,, was,, mariah

Report Upstream: N/A

Authors: Leif Leonhardy

Dependencies: 

Work issues: 

Reviewers: Jeroen Demeyer

Merged in: sage-5.0.1.rc1

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12760/gfan-0.4plus.p1-p2.diff">gfan-0.4plus.p1-p2.diff: Diff between the previous spkg in Sage and my new p2 spkg. For reference / review only.</a> by leif at 20120327T19:20:25</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12760/gfan-0.4plus.p1-p3.diff">gfan-0.4plus.p1-p3.diff: Diff between the previous spkg in Sage and my new p3 spkg. For reference / review only.</a> by leif at 20120406T00:05:53</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12760/gfan-0.4plus.p2-p3.diff">gfan-0.4plus.p2-p3.diff: Diff between my p2 and my p3 spkg.  For reference / review only.</a> by leif at 20120406T00:07:05</li></ol>