FAIL in make check Linalg/QR_update vander(12)

[Brian Gough]

Justin Hooper writes:
 > Make check gives me the following failure on redhat-6.1:
 > 
 > PASS:   QR_update vander(4)
 > ( 12, 12)[0,0]:   0.768572903784220163     0.768650834596433574
 > FAIL:   QR_update vander(12)
 > FAIL: QR Rank-1 Update
 > 

Thanks for reporting it.  The result was just over the test tolerance,
so I've increased the limit slightly.

 > This isn't particularly a routine I'm looking to use right now, but since
 > nobody else has mentioned it I was wondering if there were standard places
 > to look for problems (e.g. gcc version, etc..)

Two files in the distribution, KNOW-PROBLEMS and MACHINES (for machine
specific info).  In this case we hadn't seen this problem before
though.