Patch by Robert Scheck <robert@fedoraproject.org> for Spreadsheet-XLSX <= 0.15, which avoids the
failure "only nested arrays of non-refs are supported at /usr/share/perl5/ExtUtils/MakeMaker.pm
line 684" during build on Red Hat Enterprise Linux 6 which ships perl(ExtUtils::MakeMaker) 6.55.

--- Spreadsheet-XLSX-0.15/Makefile.PL				2015-10-30 17:11:58.000000000 +0100
+++ Spreadsheet-XLSX-0.15/Makefile.PL.makemaker			2016-01-09 07:24:28.000000000 +0100
@@ -13,5 +13,5 @@
     }, 
     ($] >= 5.005 ?     ## Add these new keywords supported since 5.005
       (ABSTRACT_FROM  => 'lib/Spreadsheet/XLSX.pm', # retrieve abstract from module
-       AUTHOR         => ['Dmitry Ovsyanko <do@eludia.ru>','Mike Blackwell <mike.blackwell@rrd.com']) : ()),
+       AUTHOR         => 'Dmitry Ovsyanko <do@eludia.ru>, Mike Blackwell <mike.blackwell@rrd.com') : ()),
 );