* guix/scripts/substitute-binary.scm: New file.
* Makefile.am (MODULES): Add it.
* nix/scripts/substitute-binary.in: New file.
* config-daemon.ac: Produce nix/scripts/substitute-binary.
* daemon.am (nodist_pkglibexec_SCRIPTS): Add
  nix/scripts/substitute-binary.
* guix/store.scm (substitutable-path-info): Use the
  `query-substitutable-path-infos' RPC.
* nix/nix-daemon/guix-daemon.cc (main): Honor `NIX_SUBSTITUTERS'.
* pre-inst-env.in: Set `NIX_SUBSTITUTERS'.
* test-env.in: Leave `NIX_SUBSTITUTERS' unchanged.  Set
  `GUIX_BINARY_SUBSTITUTE_URL, and create
  $NIX_STATE_DIR/substituter-data.
  Run `guix-daemon' within `./pre-inst-env'.
* tests/store.scm ("substitute query"): New test.

* gnu/packages/scheme.scm (bigloo): Add Avahi and libphidget as inputs,
  and pkg-config as a native input.

* gnu/packages/libphidget.scm: New file.
* Makefile.am (MODULES): Add it.

* guix/store.scm (store-path-hash-part): New procedure.
* tests/store.scm ("store-path-hash-part", "store-path-hash-part #f"):
  New tests.

* guix/gnu-maintenance.scm (http-fetch): Try #:streaming? #t, or
  'http-get*', or 'http-get' as a last resort.  Check whether DATA is
  #f, a string, or an input port.

* guix/scripts/pull.scm (%snapshot-url): Switch to the cgit URL, given
  that the Hydra one is not currently available.

* gnu/packages/xml.scm (perl-xml-parser): Fix URL.

* guix/snix.scm (snix-derivation->guix-package): Use the new names
  `nativeBuildInputs' and `propagatedNativeBuildInputs'.

* guix/gnu-maintenance.scm (http-fetch): Return an input port.
  (<gnu-package-descriptor>): Add it.
  (official-gnu-packages): Use <gnu-package-descriptor>.
  (find-packages): Add it.
  (gnu-package?): Adjust accordingly.

* guix/build/cmake-build-system.scm, guix/build-system/cmake.scm: New files.
* Makefile.am (MODULES): Add them.

* hydra.scm: Set `%fresh-auto-compile' to #t.

* gnu/packages/make-bootstrap.scm: Import (gnu packages gcc).

* guix/download.scm (%mirrors)[gnu]: Remove ftp.chg.ru.

* gnu/packages/gcc.scm (libelf): New variable.

* gnu/packages/gcc.scm (%gcc-infrastructure, isl, cloog): New variables.

* gnu/packages/base.scm (gcc-4.7): Move to...
* gnu/packages/gcc.scm: ... here.  New file.
* Makefile.am (MODULES): Add it.

* gnu/packages/glib.scm (glib)[source]: Switch to mirror://gnome.
  [inputs]: Add `patch/tests-prlimit'.
  [arguments]: Add it.
* gnu/packages/patches/glib-tests-prlimit.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

* hydra.scm: Add `eval-when' clause.

* gnu/packages/cflow.scm: New file.
* Makefile.am (MODULES): Add it.

* gnu/packages/cppi.scm: New file.
* Makefile.am (MODULES): Add it.

* guix/store.scm (write-contents)[call-with-binary-input-file]: Set
  %FILE-PORT-NAME-CANONICALIZATION to #f.
* gnu/packages.scm (search-patch, search-bootstrap-binary): Leave
  %FILE-PORT-NAME-CANONICALIZATION unchanged.  This reverts 9776ebb2.

* guix/store.scm (write-contents)[call-with-binary-input-file]: New
  procedure.
  Use `sendfile' instead of `dump' when available.  Add `size'
  parameter.
  (write-file): Update caller.

* gnu/packages/cmake.scm: New file.
* gnu/packages/patches/cmake-fix-tests.patch: New file.
* Makefile.am: Add them.

* gnu/packages.scm (search-patch, search-bootstrap-binary): Make sure no
  canonicalization occurs.  This reduces the number of 'stat' system
  calls.

* gnu/packages/lua.scm: New file.
* Makefile.am: add it.

* gnu/packages/gnupg.scm (libgcrypt): Upgrade to 1.5.1.

* build-aux/download.scm: Annihilate `shutdown' in (web client).
  Reported by Aljosha Papsch.

* release.nix (unchrootedNixpkgs): New function.
  (jobs)[tarball, build, build_disable_daemon, distro): Use it.
  Should fix <http://hydra.gnu.org:3000/build/7279>.

* release.nix: s/buildNativeInputs/nativeBuildInputs/.

* guix/scripts/package.scm (guix-package)[process-actions](show-what-to-remove/install):
  New procedure.
  Call it before `show-what-to-build'.

* gnu/packages/vpn.scm (openconnect): New variable.

This reduces the execution time of
"guix build -e '(@ (gnu packages emacs) emacs)' -d" by 6%, from
1.15s to 1.08s.

* guix/derivations.scm (build-expression->derivation): Write the builder
  as UTF-8.

This reduces the execution time of
"guix build -e '(@ (gnu packages emacs) emacs)' -d" by 25%, from
1.54 s. to 1.15s.

* guix/derivations.scm (write-sequence, write-list, write-tuple): New
  procedures.
  (write-derivation)[list->string, write-list]: Remove.
  [write-string-list, write-output, write-input, write-env-var]: New helpers.
  Rewrite in terms of these new helpers.

* guix/gnu-maintenance.scm (http-fetch): Error out when DATA is #f.
* guix/scripts/package.scm (check-package-freshness): Wrap
  `gnu-package?' call in `false-if-exception'.
  Reported by Cyril Roelandt <tipecaml@gmail.com>.

* gnu/packages/emacs.scm (emacs): Update to 24.3.  Use the .xz tarball.
* gnu/packages/patches/emacs-configure-sh.patch: Adjust.

* gnu/packages/texinfo.scm (texinfo): Update to 5.1.

* guix/store.scm (&nix-connection-error): New condition type.
  (open-connection): Translate `system-error' during the `connect' call
  into `&nix-connection-error'.
* guix/ui.scm (call-with-error-handling): Add case for `nix-connection-error?'.
* guix/scripts/package.scm (guix-package): Move `open-connection' call
  within `with-error-handling'.
* guix/scripts/pull.scm (guix-pull): Likewise.
* guix/scripts/download.scm (guix-download): Move body within
  `with-error-handling'.

* guix/packages.scm (<package>): Remove the default value for `license'.
* gnu/packages/bootstrap.scm (package-from-tarball,
  %bootstrap-glibc, %bootstrap-gcc): Initialize `license'.
* tests/packages.scm (dummy-package): Likewise.

This reverts commit 02065130.