croak "'$key' is not a valid config option for $class\n";

##</code><code>##

croak "'$key' is not a valid config option for $class\n"
          unless $key eq 'OBJECT';

##</code><code>##

--- CPP.pm_orig 2019-04-20 00:50:28.000000000 +1000
+++ CPP.pm      2024-04-17 21:16:22.142182800 +1000
@@ -114,6 +114,9 @@
   while (@config_options) {
     my ($key, $value) = (shift @config_options, shift @config_options);
     $key = uc $key;
+    if ($key eq 'OBJECT') {
+      $o->{ILSM}{MAKEFILE}{OBJECT} = $value;
+    }
     if ($key eq 'NAMESPACE') {
       _handle_namespace_cfg_option($o, $value);
     }

##</code><code>##

use Inline CPP => Config =>
  BUILD_NOISY => 1
  CLEAN_AFTER_BUILD => 0,
  OBJECT => '$(O_FILES)',
;
	
use Inline CPP;

for(1..3) {
    print "Perfect random number: ", cast_die(), "\n";
}
 
__END__
__CPP__

#include "xkcd.h"
 
int cast_die() {
    int rolled=xkcd_dice_roll();
    return rolled;
}