diff --git a/perllib/Polymake/Configure.pm b/perllib/Polymake/Configure.pm
index 8f87e49..03e9824 100644
--- a/perllib/Polymake/Configure.pm
+++ b/perllib/Polymake/Configure.pm
@@ -268,7 +268,7 @@ sub write_conf_vars {
    no strict 'refs';
    my ($pkg, $conf)=@_;
 
-   foreach my $var (@{"$pkg\::make_vars"}, @{"$pkg\::make_export_vars"}) {
+   foreach my $var (sort @{"$pkg\::make_vars"}, sort @{"$pkg\::make_export_vars"}) {
       if (defined (my $value=${"$pkg\::$var"})) {
          if ($pkg ne __PACKAGE__ && $var =~ /(?:flags|libs)/i) {
             print $conf "$var := $value \${$var}\n";
@@ -279,7 +279,7 @@ sub write_conf_vars {
    }
 
    if (my @export=grep { defined(${"$pkg\::$_"}) } @{"$pkg\::make_export_vars"}) {
-      print $conf "export ", join(" ", @export), "\n";
+      print $conf "export ", join(" ", sort @export), "\n";
    }
 }
 ###############################################################################################
@@ -288,13 +288,13 @@ sub write_config_command_line {
    my ($conf, $options, $allowed_with, $vars, $ext_failed)=@_;
 
    if (defined $vars) {
-      while (my ($item, $value)=each %$vars) {
+      while (my ($item, $value)=sort each %$vars) {
          $value="'$value'" if $value =~ /[\s(){}\[\]\$]/;
          print $conf " $item=$value";
       }
    }
 
-   while (my ($item, $value)=each %$options) {
+   while (my ($item, $value)=sort each %$options) {
       if ($value eq ".none.") {
          unless ($ext_failed && $ext_failed->{$item}) {
             print $conf " --without-$item";