The problem is simply that gprbuild (both 1.2.0 and 1.3.0) contains
examples that assume a more recent version of the Ada front-end. gnat-4.4
is roughly but not exactly equivalent to GNAT GPL 2008; releases after that
add new features for interfacing with C++ and in particular C++ virtual
methods, multiple inheritance and constructors. These features will be
available in the future package gnat-4.5.
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