GCC rightfully complains about redefined variables, as iterator declarations
appear inside loops with a loop variable of the same name.

This patch has been sent upstream.

--- a/sets.cpp	2015-06-25 11:22:08.252821681 +0200
+++ b/sets.cpp	2015-06-25 11:22:23.239187985 +0200
@@ -768,11 +768,11 @@
       //////////////////////////////////////////////
       // Reset original missing status
 
-      vector<Individual*>::iterator i = PP->sample.begin();
-      while ( i != PP->sample.end() )
+      vector<Individual*>::iterator it = PP->sample.begin();
+      while ( it != PP->sample.end() )
 	{
-	  (*i)->missing = (*i)->flag;
-	  ++i;
+	  (*it)->missing = (*it)->flag;
+	  ++it;
 	}
 
       ////////////////////////////////////////////////

--- a/elf.cpp	2009-10-10 18:00:21.000000000 +0200
+++ b/elf.cpp	2015-06-25 11:34:06.136835756 +0200
@@ -1175,10 +1175,10 @@
 	  << setw(8) << gcnt << " "
 	  << setw(8) << (double)cnt / (double)gcnt << "\n";
 
-      map<int,int>::iterator i = chr_cnt.begin();
-      while ( i != chr_cnt.end() )
+      map<int,int>::iterator it = chr_cnt.begin();
+      while ( it != chr_cnt.end() )
 	{
-	  int c = i->first;
+	  int c = it->first;
 	  int x = chr_cnt.find( c )->second;
 	  int y = chr_gcnt.find( c )->second;
 	  
@@ -1189,7 +1189,7 @@
 	      << setw(8) << y << " "
 	      << setw(8) << (double)x / (double)y << "\n";
 	  
-	  ++i;
+	  ++it;
 	}
       
     }

--- plink-1.07-src/idhelp.cpp	2009-10-10 18:00:22.000000000 +0200
+++ plink-1.07-src/idhelp.cpp.patched	2015-06-25 11:37:39.387204086 +0200
@@ -772,12 +772,12 @@
       for (int j = 0 ; j < jointField.size(); j++ )
 	{
 	  set<IDField*> & jf = jointField[j];
-	  set<IDField*>::iterator j = jf.begin();
+	  set<IDField*>::iterator jit = jf.begin();
 	  PP->printLOG(" { ");
-	  while ( j != jf.end() )
+	  while ( jit != jf.end() )
 	    {
-	      PP->printLOG( (*j)->name + " " );
-	      ++j;
+	      PP->printLOG( (*jit)->name + " " );
+	      ++jit;
 	    }
 	  PP->printLOG(" }");
 	}
f='/guix/log/?id=3fd2ecb338ed1224dc5df6ac4359365e6b1bc082'>root</a>/<a href='/guix/log/build-aux?id=3fd2ecb338ed1224dc5df6ac4359365e6b1bc082'>build-aux</a>/<a href='/guix/log/build-aux/cuirass?id=3fd2ecb338ed1224dc5df6ac4359365e6b1bc082'>cuirass</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/cuirass?id=3fd2ecb338ed1224dc5df6ac4359365e6b1bc082&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-01-15 15:18:03 +0100'>2018-01-15</span></td><td><a href='/guix/commit/build-aux/cuirass?id=403f2dccfcf992573ceeeae7c76c71b4884d3cd4'>cuirass: Properly convert list of &lt;license&gt; objects.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a bug whereby we would 'write' raw &lt;license&gt; objects when they
were in a list.

* build-aux/cuirass/gnu-system.scm (entry-&gt;sexp-entry): Add recursive
case when O is a list.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-27 22:19:28 +0200'>2017-09-27</span></td><td><a href='/guix/commit/build-aux/cuirass?id=66bc1d2aaf74fc7eb4ef9b3519c69bd37142ffb3'>cuirass: Add gnu-system build spec.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/hydra/gnu-system.scm (hydra-jobs): Support subset "hello".
* build-aux/cuirass/gnu-system.scm: New file.
* doc/guix.texi (Continuous Integration): Update example spec.
</span></span></td><td>Jan Nieuwenhuizen</td></tr>