derivations: Set input port to UTF-8 in `read-derivation'.

* guix/derivations.scm (read-derivation): Set DRV-PORT's encoding to
  UTF-8.

Update the (guix) module.

* guix.scm (%public-modules): Update list of current second-level
  modules.

tests: Use bootstrap and Nixpkgs inputs to be less costly.

* tests/builders.scm (%bootstrap-inputs, %bootstrap-guile): New
  variables.
  ("gnu-build"): Use them, by setting `#:implicit-inputs? #f' and `#:guile'.

* tests/packages.scm (%bootstrap-inputs, %bootstrap-guile): New
  variables.
  ("trivial"): Pass `#:guile %bootstrap-guile'.
  ("GNU Hello"): Use `package-with-explicit-inputs' to use
  %BOOTSTRAP-GUILE and %BOOTSTRAP-INPUTS.

build-system/{gnu,trivial-build}: Fix handling of #:guile argument.

* guix/build-system/gnu.scm (gnu-build)[guile-for-build]: Check whether
  GUILE matches string? before checking whether it matches
  derivation-path?.
* guix/build-system/trivial.scm (trivial-build)[guile-for-build]:
  Likewise.

distro: Specify use of the bootstrap Guile for the initial derivations.

* distro/packages/base.scm (%bootstrap-guile): New variable.
  (gnu-make-boot0, diffutils-boot0, findutils-boot0, binutils-boot0,
  gcc-boot0, linux-headers-boot0, glibc-final, gcc-boot0-wrapped,
  gcc-final, ld-wrapper-boot3, bash-final, guile-final): Add
  `#:guile %bootstrap-guile' to the builder's arguments.

build-system/{gnu,trivial}: Add a `#:guile' keyword parameter.

* guix/build-system/gnu.scm (package-with-explicit-inputs): New `guile'
  keyword parameter.  Add it to P's arguments, and pass it in recursive
  calls.
  (gnu-build): New `guile' keyword parameter; new `guile-for-build'
  variable.  Pass it as the `#:guile-for-build' parameter of
  `build-expression->derivation'.

* guix/build-system/trivial.scm (trivial-build): Likewise.

Support build-cores = 0; change `guix-build' to default to 0.

* guix/build/gnu-build-system.scm (%parallel-job-count): New variable.
  (build, check): Use it instead of $NIX_BUILD_CORES.

* guix-build.in (guix-build): Default to 0 for the #:build-cores option.

Augment `README'.

* README (Hacking): Mention `--with-nixpkgs'.  List the autotools and
  Gettext, as suggested by Nikita Karetnikov <nikita.karetnikov@gmail.com>.

distro: Fix typo in warning message.

* distro.scm (package-files): Add missing newline in warning message.

Add `pre-inst-env' script.

* pre-inst-env.in: New file.
* configure.ac: Add it to `AC_CONFIG_FILES' and `AC_CONFIG_COMMANDS'.

Fix and update `POTFILES.in'.

* po/POTFILES.in: Update.

distro: Add libgc.

* distro/packages/base.scm (libgc): New variable.
  (guile-2.0): Use it.

distro: Add pkg-config.

* distro/packages/base.scm (pkg-config): New variable.
  (guile-2.0): Use it.
* distro/packages/guile.scm (guile-reader): Likewise.

distro: Add the `guile', `typesetting', and `databases' package modules.

* distro.scm (package-files): Adjust PREFIX-LEN to use the top-level
  directory, not %DISTRO-MODULE-DIRECTORY.
* distro/packages/base.scm (guile-reader, guile-reader/guile-1.8,
  guile-reader/guile-2.0, lout, recutils): Move to...
* distro/packages/guile.scm, distro/packages/typesetting.scm,
  distro/packages/databases.scm: ... here.  New files.
* Makefile.am (MODULES): Add them.
  (EXTRA_DIST): Add `.dir-locals.el'.

* .dir-locals.el: New file, with settings formerly in `base.scm'.

distro: Rename (distro ...) to (distro packages ...).

* distro/base.scm, distro/ld-wrapper.scm: Move to `distro/packages'.
  Adjust LD-WRAPPER-BOOT3 input file name accordingly.
* Makefile.am (MODULES): Adjust accordingly.
* distro.scm (%distro-module-directory): Change to "/distro/packages".
* guix/build-system/gnu.scm (standard-inputs): Change module name
  to (distro packages base).
* tests/packages.scm (test-packages): Likewise.

distro: GCC: Upgrade to 4.7.2.

* distro/base.scm (gcc-4.7): Upgrade to 4.7.2.

distro: Add an `ld' wrapper, to pass missing `-rpath' flags.

* distro/ld-wrapper.scm: New file.
* Makefile.am (MODULES): Add it.

* distro/base.scm (ld-wrapper-boot3): New variable.
  (%boot3-inputs): Add LD-WRAPPER-BOOT3.
  (bash-final, guile-final, ld-wrapper): New final.
  (%final-inputs): Use BASH-FINAL; add LD-WRAPPER.
  (gcc-4.7): Remove the `-rpath' trick from the `lib' spec string.

distro: gcc: Patch `lib' spec to add `-rpath' for each `-L'.

* distro/base.scm (gcc-4.7): Patch `LIB_SPEC' to add `-rpath' for each
  `-L'.  Spec string suggested by Marc Glisse <marc.glisse@inria.fr>.
  (libtool): Add `libtool-skip-tests.patch'.

* distro/patches/libtool-skip-tests.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

Add (guix ftp) and companion modules.

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

* distro/base.scm (libffi): Use `ftp-fetch'.

distro: Use our own Perl during bootstrap.

* distro/base.scm (linux-headers-boot0): Use PERL with %BOOT0-INPUTS
  instead of calling out to `nixpkgs-derivation*'.