To download the upstream sources directly:
- direct a navigator to "http://libre.adacore.com/libre/download"
- select "Free Software or Academic Development"
- click on the "Build Your Download Package" button
- select any platform and year $(year)
- deploy the "GNAT $(year)" item
- deploy the "Sources" subitem.
- click on the "gprbuild-gpl-$(year)-src.tgz" hyperlink

The upstream archive is repackaged with
# mk-origtargz gprbuild-gpl-$(year)-src.tar.gz \
  --package=gprbuild --version=$(year)dfsg \
  --exclude-file=$(exclude1) --exclude-file=$(excluded2) ..
Please refer to the copyright file in this directory to know which
files are excluded and why.

To compare with previous version,
  tar xf gprbuild_$(year).tar.gz
  diff -urN $(previous_version_directory) gprbuild-$(year)-src
You may want to ignore the sources in the gnat/ subdirectory,
as they are unused anyway.

When the gcc compiler changes version, the following files must be edited:
  changelog
  control
  README.Debian
  patches/gprconfig.patch
  tests/examples

 -- Nicolas Boulenguez <nicolas@debian.org>, Sat,  8 Nov 2014 16:02:45 +0100
