Use the native version as the build part

src/alire-hooks.ads

@@ -4,6 +4,8 @@ package Alire.Hooks with Preelaborate is
 
    --  Hackish way to enable Alire to obtain some platform-specific info that only Alr knows how to get
 
-   Version_Getter_Hook : access function (O : Origins.Origin) return String;
+   --  WARNING: this will be null during elaboration!
+
+   Version_Getter : access function (O : Origins.Origin) return String;
 
 end Alire.Hooks;

src/alire-releases.adb

@@ -1,5 +1,6 @@
 with Alire.Conditional_Values;
 with Alire.Dependencies.Vectors;
+with Alire.Hooks;
 with Alire.Platforms;
 with Alire.Requisites.Booleans;
 
@@ -241,6 +242,28 @@ package body Alire.Releases is
       return False;
    end Property_Contains;
 
+   -------------
+   -- Version --
+   -------------
+
+   function Version (R : Release) return Semantic_Versioning.Version is
+      use Hooks;
+   begin
+      if Hooks.Version_Getter /= null and then R.Origin.Is_Native then
+         declare
+            Native_Version : constant String := Hooks.Version_Getter (R.Origin);
+         begin
+            if Native_Version /= "" then
+               return New_Version (Image (R.Version) & "+" & Native_Version);
+            else
+               return R.Version;
+            end if;
+         end;
+      else
+         return R.Version;
+      end if;
+   end Version;
+
    --------------
    -- Whenever --
    --------------

src/alire-releases.ads

@@ -165,7 +165,6 @@ private
    function Project (R : Release) return Name_String is (Projects.Image (R.Name));
    function Description (R : Release) return Description_String is (Projects.Description (R.Name));
    function Notes (R : Release) return Description_String is (R.Notes);
-   function Version (R : Release) return Semantic_Versioning.Version is (R.Version);
    
    function Depends (R : Release) return Conditional.Dependencies is (R.Dependencies);