Error on GtkAda

[Richard Kenner]

    (at least I would expect that the internal ACT test suite covers
    compiling GtkAda ;-).

Yes, it does include compiling it, but, as has been said for a while, the
test suite does not yet completely pass with a GCC3-based GNAT.  Indeed,
an error compiling GtkAda came up recently.

So don't assume that the upcoming merge will fix all remaining problems:
it won't, there are still some left.