* guix/derivations.scm (derivation): Add #:local-build? parameter and
  honor it.
  (build-expression->derivation): Likewise.
* doc/guix.texi (Derivations): Update documentation of these
  procedures.

* gnu/packages/fltk.scm: New file
* gnu-system.am: New file fltk.scm

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

* gnu/packages/xorg.scm (libxft): Propagate input libxrender.

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

* gnu/packages/ncdu.scm: New file
* gnu-system.am: New file ncdu.scm

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

* gnu/packages/ssh.scm (corkscrew): New variable.

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

* gnu/packages/dc.scm : New module.
* gnu-system.am (GNU_SYSTEM_MODULES): Add module.

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

Fixes <http://bugs.gnu.org/16484>.
Reported by Andreas Enge <andreas@enge.fr>.

* guix/profiles.scm (profile-derivation)[builder]: Remove "building
  profile '~a' with ~a packages" message.

* doc/guix.texi (Daemon Offload Setup): Start with "When desired".  Say
  more on what can go in 'machines.scm', and mention Guile-Avahi.
  (Invoking guix-daemon): Document '--no-build-hook'.
  (Invoking guix build): Add xref to "Daemon Offload Setup".

* gnu/packages/wget.scm (wget): Upgrade to 1.15.  Remove Gettext from
  'inputs'.  Move Perl to 'native-inputs'.

* gnu/packages/video.scm (ffmpeg): Update to 2.1.3.

* gnu/packages/video.scm (ffmpeg): Add input opus.

* gnu/packages/xiph.scm (opus): New variable.

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

* nix/nix-daemon/guix-daemon.cc (GUIX_OPT_NO_BUILD_HOOK): New macro.
  (options): Add '--no-build-hook'.
  (parse_opt): Handle it.
  (main)[HAVE_DAEMON_OFFLOAD_HOOK]: Set 'useBuildHook' by default.
  Set $NIX_BUILD_HOOK to our offload hook unless otherwise specified.
  [!HAVE_DAEMON_OFFLOAD_HOOK]: Clear 'useBuildHook'.
* pre-inst-env.in: Set and export NIX_BUILD_HOOK.
* nix/scripts/offload.in, guix/scripts/offload.scm: New files.
* guix/ui.scm (show-guix-help)[internal?]: Add "offload".
* config-daemon.ac: Call 'GUIX_CHECK_UNBUFFERED_CBIP'.
  Instantiate 'nix/scripts/offload'.  Set 'BUILD_DAEMON_OFFLOAD'
  conditional, and optionally define 'HAVE_DEAMON_OFFLOAD_HOOK' cpp
  macro.
* daemon.am (nodist_pkglibexec_SCRIPTS)[BUILD_DAEMON_OFFLOAD]: Add it.
* Makefile.am (MODULES)[BUILD_DAEMON_OFFLOAD]: Add
  'guix/scripts/offload.scm'.
  (EXTRA_DIST)[!BUILD_DAEMON_OFFLOAD]: Likewise.
* m4/guix.m4 (GUIX_CHECK_UNBUFFERED_CBIP): New macro.
* doc/guix.texi (Setting Up the Daemon): Move most of the body to...
  (Build Environment Setup): ... this.  New subsection.
  (Daemon Offload Setup): New subsection.

* guix/store.scm (topologically-sorted): New procedure.
* tests/store.scm ("topologically-sorted, one item",
  "topologically-sorted, several items", "topologically-sorted, more
  difficult"): New tests.

* guix/nar.scm (&nar-invalid-hash-error, &nar-signature-error): New
  condition types.
  (&nar-error): Add 'file' and 'port' fields.
  (&nar-read-error): Remove 'port' and 'file' fields.
  (lock-store-file, unlock-store-file, finalize-store-file,
  temporary-store-directory, restore-file-set): New procedures.
* tests/nar.scm (%seed): New variable.
  (random-text): New procedure.
  ("restore-file-set (signed, valid)", "restore-file-set (missing
  signature)", "restore-file-set (corrupt)"): New tests.
* po/Makevars (XGETTEXT_OPTIONS): Add '--keyword=message'.nar fixes
* po/POTFILES.in: Add guix/nar.scm.

* guix/store.scm (with-store): New macro.

* guix/hash.scm (open-sha256-input-port): New procedure.
* tests/hash.scm (supports-unbuffered-cbip?): New procedure.
  ("open-sha256-input-port, empty", "open-sha256-input-port, hello",
  "open-sha256-input-port, hello, one two",
  "open-sha256-input-port, hello, read from wrapped port"): New tests.

* guix/pki.scm (signature-subject, signature-signed-data,
  valid-signature?): New procedures.
* guix/scripts/authenticate.scm (guix-authenticate): Adjust to use
  them.

* guix/utils.scm (%struct-flock, F_SETLKW, F_xxLCK): New variables.
  (fcntl-flock): New procedure.
* tests/utils.scm ("fcntl-flock"): New test.

* guix/store.scm (register-path): New procedure.
* tests/store.scm ("register-path"): New test.
* guix/config.scm.in (%guix-register-program): New variable.
* configure.ac: Compute and substitute 'guix_sbindir'.  Compute
  'guix_prefix'.
* pre-inst-env.in: Define 'GUIX_REGISTER'.

* nix/guix-register/guix-register.cc (register_validity): Leave
  'info.path' unmodified when PREFIX is empty.
  (main): Call 'settings.processEnvironment' early on.
  Leave 'settings.nixStore' unmodified when PREFIX is empty.

* guix/store.scm (process-stderr): Add comments for the various
  constants, to help when stracing.

* guix/ui.scm (show-guix-help)[internal?]: New procedure.
  Use it to filter out internal commands reported by '--help'.

* gnu/packages/oggvorbis.scm: Rename this ...
* gnu/packages/xiph.scm: ... to this. Adjust module name accordingly.
* gnu-system.am (GNU_SYSTEM_MODULES): Update.
* gnu/packages/{gnunet.scm, libcanberra.scm, mp3.scm, pulseaudio.scm, sdl.scm,
    video.scm}: Use new module name.

* gnu/packages/sqlite.scm (sqlite): Upgrade to 3.8.2.

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

* gnu/packages/guile.scm (guile-2.0): Use LIBGC-7.4.
  (guile-2.0/fixed): Keep using LIBGC.

* gnu/packages/bdw-gc.scm (libatomic-ops, libgc-7.4): New variables.

* gnu/packages/bdw-gc.scm (libgc)[license]: Use 'x11-style'.

* gnu/packages/admin.scm (isc-dhcp): Change license to ISC.

* gnu/packages/games.scm (gnubik): Synchornize synopsis and description.

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

* guix/licenses.scm (fdl1.3+): New variable.

* gnu/packages/glib.scm (glib): Upgrade to 2.39.1.  Run tests
  sequentially.
* gnu/packages/patches/glib-tests-desktop.patch: Adjust for 2.39.1.  Add
  hunk for gsettings.c.

* doc/guix.texi (Setting Up the Daemon): List what's in the chroot.

* nix-upstream: Update sub-module.
* daemon.am (libutil_a_SOURCES): Add affinity.cc.
  (libutil_headers): Add affinity.hh.
  (libexec_PROGRAMS, nix_setuid_helper_SOURCES,
  nix_setuid_helper_CPPFLAGS, nix_setuid_helper_LDADD): Remove.
* doc/guix.texi (Setting Up the Daemon): Remove paragraph about
  'nix-setuid-helper'.
* guix/scripts/substitute-binary.scm (guix-substitute-binary): Exit 0 when
  %CACHE-URL has an HTTP scheme and looking up its host fails.
  Always print a newline to stdout when starting.

Reported by zerwas on #guix.

* guix/build/linux-initrd.scm (make-essential-device-nodes): Make
  /dev/null and /dev/zero world-writable.

* gnu/packages/gl.scm (mesa): Propagate input libx11.

* build-aux/hydra/guix.scm: Set '%load-verbosely'.

* gnu/packages/gl.scm: Add copyright notice for mesa, moved here from
    module xorg in commit 200726ed.