Start with 2000f, which is the first release that seems to be compatible with vzic.

Author: minichma

.gitattributes

@@ -1,3 +1,5 @@
 
 # don't modify the line endings of generated zoneinfo files (they use CRLF according to the specification).
 /zoneinfo/** text eol=crlf
+
+/settings.config text eol=lf

settings.config

@@ -1,5 +1,5 @@
 
-VZIC_RELEASE_NAME=
+VZIC_RELEASE_NAME=2000f
 VZIC_BASE_RELEASE_NAME=
 
 # The source tzdata is downloaded from this URL.

vzic-merge.pl

@@ -76,9 +76,36 @@
 
     $copy_to_master = 0;
 
-    # If the ics file exists in the master copy we have to compare them,
-    # otherwise we can just copy the new file into the master directory.
-    if (-e $master_file) {
+    if (-l $new_file) {
+        # This is a symlink, copy it in any case.
+
+        if (!-e $master_file) {
+            print "Creating new symlinkg $new_file...\n";
+            $copy_to_master = 1;
+        } elsif (-l $master_file) {
+            my $src = readlink($master_file);
+            my $dst = readlink($new_file);
+
+            if ($src eq $dst) {
+                $copy_to_master = 0;
+                # print "Symlink $new_file unchanged: $src.\n"
+            } else {
+                print "Updating symlink $new_file to $src...\n";
+                $copy_to_master = 1;
+            }
+
+        } else {
+            print "Changing $new_file to symlink...\n";
+            $copy_to_master = 1;
+        }
+
+    } elsif (-l $master_file) {
+        $copy_to_master = 1;
+        print "Changing $new_file from symlink to real file...\n";
+
+    } elsif (-e $master_file) {
+        # If the ics file exists in the master copy we have to compare them,
+        # otherwise we can just copy the new file into the master directory.
         open (MASTERZONEFILE, "$master_file")
             || die "Can't open file: $master_file";
         undef $/;
@@ -131,10 +158,22 @@
                 make_path $directories or die "Failed to create path: $directories";
             }
 
-            open (MASTERZONEFILE, ">$master_file")
-            || die "Can't create file: $master_file";
-            print MASTERZONEFILE $new_contents;
-            close (MASTERZONEFILE);
+            if ( -e $master_file ) {
+                # delete old file so we don't have issues with symlinks
+                unlink($master_file)
+            }
+
+            if ( -l $new_file ) {
+                my $dst = readlink($new_file) || die "Can't read symlink $new_file.";
+
+                print "Creating symlink to $dst in $master_file.\n";
+                symlink $dst, $master_file || die "Can't create symlink $new_file.";
+            } else {
+                open (MASTERZONEFILE, ">$master_file")
+                || die "Can't create file: $master_file";
+                print MASTERZONEFILE $new_contents;
+                close (MASTERZONEFILE);
+            }
         }
     }
 }