* gnu/packages/xorg.scm (libxcb): Add configure flag "--enable-xkb".

* gnu/packages/gnome.scm (brasero): New variable; not totally usable due to
    lacking inputs.

* gnu/packages/gnome.scm (hicolor-icon-theme): New variable.

* gnu/packages/gnome.scm (gnome-icon-theme): New variable.

* gnu/packages/gnome.scm (icon-naming-utils): New variable.

* gnu/packages/xml.scm (perl-xml-simple): New variable.

* gnu/packages/gnome.scm (gsettings-desktop-schemas): New variable.

* gnu/packages/xnee.scm (xnee): Drop unused input gtk+.

* gnu/packages/glib.scm (itstool): Do as announced in 9000d556.

* gnu/packages/glib.scm (itstool): Add propagated input python-2; it is needed
    to rewrite the shebang in the output python script and must be propagated
    so that PYTHONPATH gets set when using itstool; and libxml2, imported as a
    module by the script.

* gnu/packages/libcanberra.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

* gnu/packages/oggvorbis.scm (libvorbis): Propagate input libogg, as
    stipulated by the pkg-config files.

* gnu/packages/gnome.scm (libnotify): New variable.

* gnu/packages/scheme.scm (racket): Revert input from gtk+-3 to gtk+-2.

* gnu/packages/gtk.scm (gtk+): Propagate inputs at-spi2-atk, libxi and
    libxinerama.

* gnu/packages/cdrom.scm (dvdisaster): Replace input gtk+ by gtk+-2.
* gnu/packages/emacs.scm (emacs): Replace input gtk+ by gtk+-2.
* gnu/packages/geeqie.scm (geeqie): Replace input gtk+ by gtk+-2.
* gnu/packages/gkrellm.scm (gkrellm): Replace input gtk+ by gtk+-2.
* gnu/packages/mp3.scm (ripperx): Replace input gtk+ by gtk+-2.
* gnu/packages/scheme.scm: Drop duplicate inclusion of module gtk.

* gnu/packages/gtk.scm (gtk+-2): Update to 2.24.21, add inputs perl and
    python.

* gnu/packages/gtk.scm (gtk+): Switch to version 3.10.0.
* gnu/packages/gtk.scm (gtk+-2): New name for version 2.24.20.

* gnu/packages/gtk.scm (gtk+-3): Delete variable.

* gnu/packages/gtk.scm (at-spi2-atk): New variable.

* gnu/packages/gtk.scm (atk): Update to 2.10.0.

* gnu/packages/gtk.scm (at-spi2-core): New variable.

* gnu/packages/xorg.scm (libxi): Propagate inputs inputproto and libx11,
    as stipulated by xi.pc.

* gnu/packages/glib.scm (glib): Update to 2.38.0 and drop rewriting of GTESTER.
* gnu/packages/patches/glib-tests-homedir.patch: Update patch for 2.38.0.
* gnu/packages/patches/glib-tests-desktop.patch: Update patch for 2.38.0 and
    drop test dbus-appinfo.

* gnu/packages/glib.scm (gobject-introspection): New variable.

* gnu/packages/version-control.scm (git): Add "gui" output.  Add Tcl/Tk
  as inputs.  Add #:configure-flags.  Augment 'split' phase to handle
  graphical user interfaces.

* gnu/packages/version-control.scm (git): Wrap 'git-svn', not 'git', for
  PERL5LIB and LD_LIBRARY_PATH.

* gnu/packages/web.scm (httpd): New variable
* gnu-system.am (GNU_SYSTEM_MODULES): Add it

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Reported by Nikita Karetnikov <nikita@karetnikov.org>.

* gnu/packages/compression.scm (bzip2): Add 'set-cross-environment'
  phase for cross-compilation.

* gnu/packages/version-control.scm (git): Add SUBVERSION as an input.
  Add 'split' phase.

* gnu/packages/version-control.scm (subversion): Add
  'install-perl-bindings' phase.

* gnu/packages/swig.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

* gnu/packages/gnunet.scm (libmicrohttpd): Update to 0.9.30.

* gnu/packages/bison.scm (bison): Move FLEX to 'inputs', and remove the
  hack that turned off its test suite.
* gnu/packages/flex.scm (flex): Add 'bison-for-tests' in 'inputs', and
  use that to run the tests.

* gnu/packages/skribilo.scm (skribilo): New variable.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

* gnu/packages/gtk.scm (guile-cairo): New variable.

* gnu/packages/cdrom.scm (xorriso): Update to 1.3.2.

* gnu/packages/lightning.scm (lightning): Update to 2.0.1.

* gnu/packages/freeipmi.scm (freeipmi): Update to 1.3.2.