- added check if override does not override but set a value

lib/SLUB/LZA/TA.pm

@@ -64,15 +64,22 @@ BEGIN {
 
 sub _override_config ($override, $opt) {
     #no warnings;
-    if (
-        (exists $opt->{$override})
-            and ($config{$override} ne $opt->{$override})
-    ) {
-        say STDERR <<"HINT";
+
+    if (exists $opt->{$override}) {
+        if (!exists $config{$override}) {
+            $config{$override} = $opt->{$override};
+        }
+        if (
+            (!defined $config{$override})
+                or ($config{$override} ne $opt->{$override})
+        ) {
+            #use Data::Printer; p($override); p(%config); p($opt);
+            say STDERR <<"HINT";
 Hint: override local config with:
           $override => $opt->{$override} (config: $config{$override})
 HINT
-        $config{$override} = $opt->{$override};
+            $config{$override} = $opt->{$override};
+        }
     }
     #use warnings;
     return 1;