Index: config/auto/bc.pl
===================================================================
--- config/auto/bc.pl	(revision 7825)
+++ config/auto/bc.pl	(working copy)
@@ -22,7 +22,7 @@
 @args = qw(verbose);
 
 sub runstep {
-    my $a = `bc -v` || '';
+    my $a = `bc -v 2>&1` || '';
     # This seems to work for GNU bc 1.06
     my $has_bc = ($a =~ m/^bc /) ? 1 : 0;