Require Perl 5.12

Fix some postfix 'if' statements too.

make-block.pl

@@ -13,7 +13,7 @@
 # You may NOT use this software for commercial purposes.
 ###############################################################################
 
-use strict;
+use 5.012;
 use warnings;
 
 use Getopt::Long qw/ GetOptions :config no_ignore_case /;
@@ -27,7 +27,9 @@ sub add_domain_list {
     my $file = shift;
     foreach my $line (read_stripped($file)) {
         my $domain = lc $line;
-        ++$dupes if defined $domains{$domain};
+        if (defined $domains{$domain}) {
+            ++$dupes;
+        }
         $domains{$domain} = 1;
     }
 }
@@ -47,7 +49,9 @@ sub add_host_file {
             next;
         }
         my $domain = lc $parts[1];
-        ++$dupes if defined $domains{$domain};
+        if (defined $domains{$domain}) {
+            ++$dupes;
+        }
         $domains{$domain} = 1;
     }
 }
@@ -117,7 +121,13 @@ MAIN: {
     printf STDERR "%d domains written to %s from\n", $written, $out // 'STDOUT';
     printf STDERR " - %d .domains files\n", (scalar @domain_lists);
     printf STDERR " - %d .hosts files\n", (scalar @hosts_lists);
-    printf STDERR "(%d duplicates)\n", $dupes if $dupes;
-    printf STDERR "(%d domains removed via allowlist)\n", $removed_allowed if $removed_allowed;
-    printf STDERR "(%d skipped)\n", $skip if $skip;
+    if ($dupes) {
+        say STDERR "($dupes duplicates)";
+    }
+    if ($removed_allowed) {
+        say STDERR "($removed_allowed domains removed via allowlist)";
+    }
+    if ($skip) {
+        say STDERR "($skip skipped)";
+    }
 }