* gnu/services/xorg.scm (<session-type>): New record type.
  (%windowmaker-session-type, %ratpoison-session-type): New variables.
  (%default-xsessions): Use them.
  (xsessions-directory): Expect SESSIONS to be a list of <session-type>
  and rewrite accordingly.
  (slim-service): Adjust docstring.
* doc/guix.texi (X Window): Update accordingly.

* guix/scripts/substitute-binary.scm (open-cache*): New macro.
  (guix-substitute-binary): Use it instead of (delay (open-cache ...)).

Fixes <http://bugs.gnu.org/19677>.
Reported by Mark H Weaver <mhw@netris.org>.

* guix/hash.scm: Use (guix gcrypt).
  (sha256, open-sha256-md, md-write, md-close): Use 'libgcrypt-func'
  instead of 'dynamic-func'.

* guix/gcrypt.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/pk-crypto.scm: Use it.
  (libgcrypt-func, gcrypt-version): Remove.

* gnu-system.am (dist_patch_DATA): Add
  'gobject-introspection-absolute-shlib-path.patch' and
  'gobject-introspection-girepository.patch'.

Before that it would check all the URIs of each package.

* guix/scripts/lint.scm (validate-uri): Really return #f on failure and
  #t otherwise.
  (check-source): Replace 'for-each' with 'any'.

* gnu/services/dbus.scm (dbus-configuration-directory)[services->sxml]:
  Produce a <servicedir> tag.

* gnu/packages.scm (search-bootstrap-binary): Raise an error when
  FILE-NAME is not found.

This reverts commit 03c27765.

This reverts commit a6ae52fe.

* gnu/packages/netpbm.scm (netpbm): Correct hash.

Fixes <http://bugs.gnu.org/19686>.
Reported by Marek Benc <dusxmt@gmx.com> and Mark Weaver <mhw@netris.org>.

* gnu/packages/qt.scm (python-pyqt, python2-pyqt): New variables.
* gnu/packages/patches/pyqt-configure.patch: New file.
* gnu-system.am (dist_patch_DATA): Register patch.

* gnu/packages/qt.scm (python.sip, python2-sip): New variables.

* guix/scripts/lint.scm (validate-uri?): New procedure.
  (%checkers): Add 'source' checker

* gnu/packages/netpbm.scm (netpbm): Update to 10.69.04.

Fixes <http://bugs.gnu.org/19630>.
Reported by Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>.

* guix/derivations.scm (&derivation-error,
  &derivation-missing-output-error): New error conditions.
  (derivation->output-path): Raise a '&derivation-missing-output-error'
  if OUTPUT is not an output of DRV.
* guix/ui.scm (call-with-error-handling): Add case for
  'derivation-missing-output-error?'.
  (show-what-to-build): Check whether (derivation-outputs drv) is
  empty.
* tests/packages.scm ("reference to non-existent output"): Add test.

* gnu/packages/video.scm (libdvdnav): New variable.

* gnu/packages/video.scm (libdvdread): New variable.

* gnu/packages/video.scm (youtube-dl): Update to 2015.01.23.4.

* gnu/packages/freeipmi.scm (freeipmi): Update to 1.4.8.

* gnu/packages/xnee.scm (xnee): Update to 3.19. This requires gtk+-2 as
    additional input.

* gnu/services/base.scm (guix-service): Change AUTHORIZE-HYDRA-KEY?
  default value to #t.

Fixes an Evince regression introduced in commit 3d243e9c.

* guix/build/glib-or-gtk-build-system.scm (data-directories): Check the
  /mime sub-directory.

* gnu/packages/netpbm.scm (netpbm): Use svn-fetch for the source instead
    of a separately hosted tarball.

* gnu/packages/python.scm (python-pyparsing, python2-pyparsing): Update to 2.0.3.

* gnu/packages/glib.scm (gobject-introspection): Add patch
  gobject-introspection-girepository.patch.

* gnu/packages/gtk.scm (gtk+)[inputs]: Add CUPS.

* doc/emacs.texi (Emacs Initial Setup): Mention that it works
  out-of-the-box on GSD.

* configure.ac: Change version to 0.8.1.

* gnu/packages/gnunet.scm (libmicrohttpd): Update to 0.9.39.

* gnu/packages/version-control.scm (rcs): Update to 5.9.4.

* gnu/packages/parallel.scm (parallel): Update to 20150122.

* gnu/packages/gnupg.scm (libassuan): Update to 2.2.0.

* gnu/packages/linux.scm (util-linux)[source](snippet): Set
  "build_kill=no" in 'configure'.

* gnu/packages/linux.scm (e2fsprogs)[arguments]: Add --disable-blkid
  --disable-libuuid --disable-uuidd --disable-fsck.

* gnu/packages/linux.scm (util-linux): Update to 2.25.2.  Remove
  util-linux-perl.patch, and add util-linux-tests.patch.  Adjust
  'snippet'.
  [arguments]: Remove 'patch-chkdupexe' phase.  Add 'pre-check' phase.
  [native-inputs]: Add NET-BASE.
* gnu/packages/patches/util-linux-perl.patch: Remove.
* gnu/packages/patches/util-linux-tests.patch: New file.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

* gnu/packages/linux.scm (e2fsprogs): Update to 1.42.11.

* gnu/system/os-config.tmpl (services): New field.