Add darwin specific version / release to $*KERNEL

src/core/Kernel.pm

@@ -4,9 +4,10 @@
 # with the values that you expected and how to get them in your situation.
 
 class Kernel does Systemic {
-    has $!hardware;
-    has $!arch;
-    has $!bits;
+    has Str $.release;
+    has Str $!hardware;
+    has Str $!arch;
+    has Int $!bits;
 
     submethod BUILD (:$!auth = "unknown") {}
 
@@ -26,16 +27,35 @@ class Kernel does Systemic {
     method version {
         $!version //= Version.new( do {
             given $*DISTRO.name {
-                when any <linux macosx> { # needs adapting
+                when 'linux' { # needs adapting
                     qx/uname -v/.chomp;
                 }
+                when 'macosx' {
+                    my $unamev = qx/uname -v/;
+                    $unamev ~~ m/^Darwin \s+ Kernel \s+ Version \s+ (<[\d\.]>+)/
+                      ?? ~$0
+                      !! $unamev.chomp;
+                }
                 default {
                     "unknown";
                 }
             }
         } );
     }
 
+    method release {
+        $!release //= do {
+            given $*DISTRO.name {
+                when any <linux macosx> { # needs adapting
+                    qx/uname -v/.chomp;
+                }
+                default {
+                    "unknown";
+                }
+            }
+        }
+    }
+
     method hardware {
         $!hardware //= do {
             given $*DISTRO.name {