--- loncom/build/distprobe	2011/05/05 15:48:25	1.18
+++ loncom/build/distprobe	2011/05/06 21:29:41	1.19
@@ -2,7 +2,7 @@
 #
 # The LearningOnline Network with CAPA
 #
-# $Id: distprobe,v 1.18 2011/05/05 15:48:25 raeburn Exp $
+# $Id: distprobe,v 1.19 2011/05/06 21:29:41 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -55,7 +55,7 @@ if (-e '/etc/redhat-release') {
         $dist = 'rhes'.$1;
     } elsif ($versionstring =~ /CentOS release (\d+)/) {
         $dist = 'centos'.$1;
-    } elsif ($versionstring =~ /Scientific Linux (SL )?release ([\d.]+) /) {
+    } elsif ($versionstring =~ /Scientific Linux (?:SL )?release ([\d.]+) /) {
         my $ver = $1;
         $ver =~ s/\.\d+$//;
         $dist = 'scientific'.$ver;