* gnu-system.am (GNU_SYSTEM_MODULES): Add gnu/services/colord.scm.
* gnu/services/colord.scm: New file.
* doc/guix.texi (Various Services): Document it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

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

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

* gnu/packages/gtk.scm (at-spi2-core)[outputs]: New field.
  [arguments]: Add #:configure-flags.

* gnu/packages/gtk.scm (at-spi2-atk): Move at-spi2-core to 'propagated-inputs'.
  Move dbus to 'native-inputs'.

* gnu/packages/gtk.scm (at-spi2-atk)[arguments]: Remove #:tests? #f.
  Add #:phases.

* gnu/packages/gtk.scm (atk): Move glib to 'propagated-inputs'.

* gnu/packages/gtk.scm (at-spi2-atk): Update to 2.16.0.

* gnu/packages/gtk.scm (atk)[outputs]: New field.
  [arguments]: New field.

* gnu/packages/gtk.scm (atk): Update to 2.16.0.

* gnu/packages/gtk.scm (at-spi2-core)[arguments]: Add #:make-flags.
  [native-inputs]: Add gobject-introspection.

* gnu/packages/gtk.scm (at-spi2-core): Move dbus and glib to
  'propagated-inputs'.

* gnu/packages/gtk.scm (at-spi2-core)[arguments]: Remove #:tests? #f.
  Add #:phases.

* gnu/packages/gtk.scm (at-spi2-core): Update to 2.16.0.

* gnu/packages/gtk.scm (gtk+-2)[outputs]: New field.
  [arguments]<#:configure-flags>: Add '--with-html-dir'.

* gnu/packages/gtk.scm (gtk+-2)[inputs]: Add cups, libxcomposite,
  libxcursor, libxdamage, libxi, libxinerama and libxrandr.
  [native-inputs]: Add gettext.
  [arguments]: Add #:configure-flags.

* gnu/packages/gtk.scm (gtk+-2): Update to 2.24.27.

* gnu/packages/julia.scm (julia)[arguments]: Pass "MARCH" flag for supported
  architectures.

* gnu/packages/julia.scm (julia): Add 'supported-systems' field.

* gnu/packages/audio.scm (wavpack)[arguments]: New field.

Suggested by Mark H Weaver.

* doc/guix.texi (Setting Up the Daemon): Add xref to "Substitutes".

* doc/guix.texi (Package Modules): Mention the relation between module
  names and file names.

* doc/guix.texi (Invoking guix package): Mention that the current
  generation is not deleted.  This is a followup to d26eb84d.

* guix/ui.scm (warn-about-load-error): New procedure.
* gnu/packages.scm (package-modules): Wrap 'resolve-interface' call in
  'catch #t', and call 'warn-about-load-error' in handler.

* guix/scripts/system.scm (read-operating-system): Replace error
  handling code by a call to 'report-load-error'.
* guix/ui.scm (report-load-error): New procedure.

* gnu/packages/ld-wrapper.scm: Rename to...
* gnu/packages/ld-wrapper.in: ... this.
* gnu/packages/base.scm (make-ld-wrapper): Adjust "wrapper" input
  accordingly.
* gnu-system.am (GNU_SYSTEM_MODULES): Remove ld-wrapper.scm.
  (MISC_DISTRO_FILES): New variable.

* gnu/packages/gcc.scm (gcc-4.7)[arguments]: Pass
  #:validate-runpath? #f.
* gnu/packages/commencement.scm (gcc-boot0)[arguments]: Override
  #:validate-runpath? with 'substitute-keyword-arguments'.
  (gcc-final)[arguments]: Likewise.
* gnu/packages/cross-base.scm (cross-gcc-arguments): Likewise.

* gnu/packages/ld-wrapper.scm (%disable-rpath?): New variable.
  (rpath-arguments): Honor it.

This avoids adding bogus entries to the RUNPATH of installed binaries,
pointing to the build directory or similar.

* gnu/packages/ld-wrapper.scm (store-file-name?): New procedure.
  (rpath-arguments): Add "-rpath" flag on when FILE matches
  'store-file-name?', not when it matches 'pure-file-name?'.

* gnu/packages/ld-wrapper.scm (readlink*, dereference-symlinks): New
  procedures.
  (pure-file-name?): Use it instead of local loop.

* gnu/packages/linux.scm (kbd): Update to 2.0.2.

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

* gnu/packages/music.scm (solfege): New variable.

* gnu/packages/audio.scm (csound): New variable.

* gnu/packages/linux.scm (libiec61883): New variable.

* gnu/packages/apl.scm (apl): Update to 1.5.

* gnu/packages/parallel.scm (parallel): Update to 20150322.

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

* gnu/packages/glib.scm (dbus): Update to 1.8.16.

* gnu/packages/gnutls.scm (gnutls): Update to 3.3.14.