The build generates a lot of warnings! But also some errors.

This in alire-conditional_trees.ads,

   525.    function Root (This : Tree) return Node'Class is
   526.      (This.Constant_Reference);
              |
        >>> actual for explicitly aliased formal is too short lived

This could well be a compiler issue, of course.

Likewise in alire-dependencies-states.adb,

     8.    overriding function "=" (L, R : Stored_Release) return Boolean
     9.    is
    10.       use type Milestones.Milestone;
    11.       use type Origins.Origin;
    12.    begin
    13.       return
    14.         (L.Is_Empty and then R.Is_Empty)
    15.         or else
    16.           (not L.Is_Empty and then not R.Is_Empty
    17.            and then
    18.            L.Constant_Reference.Milestone = R.Constant_Reference.Milestone
                   1                                2
        >>> actual for explicitly aliased formal is too short lived
        >>> actual for explicitly aliased formal is too short lived

    19.            and then
    20.            L.Constant_Reference.Origin = R.Constant_Reference.Origin);
                   1                             2
        >>> actual for explicitly aliased formal is too short lived
        >>> actual for explicitly aliased formal is too short lived

    21.    end "=";

Also, more definitely a problem,

alire-manifest.adb:47:07: actual for "This" must be a variable
alire-manifest.adb:258:26: actual for "This" must be a variable
alire-manifest.adb:269:07: actual for "This" must be a variable

the first of which is

    47.       Replacer.Replace; -- All went well, keep the changes
              |
        >>> actual for "This" must be a variable

(Replacer is declared constant)