* configure.ac: Use Automake's `gnu' option.
* ChangeLog, NEWS: New files.

* Makefile.am (TESTS_ENVIRONMENT): Remove `guile' invocation.  Add
  semicolons, and export the variables as shown in the Automake 1.12
  manual.
  (LOG_COMPILER): New variable, with `guile' invocation.

* po/Makevars (XGETTEXT_OPTIONS): Add `--from-code=UTF-8'.

* distro/base.scm (guile-reader): New procedure.
  (guile-reader/guile-1.8, guile-reader/guile-2.0): New variables.

* guix/derivations.scm (build-expression->derivation)[prolog]: Unset
  `LD_LIBRARY_PATH'.

* guix/build-system/gnu.scm (%standard-inputs): Add "findutils".

* distro/base.scm (guile-2.0): Propagate libunistring and Libtool.

* distro/base.scm (guile-1.8): Propagate GMP and Libtool.

* guix/packages.scm (package-transitive-inputs): New procedure.
  (package-derivation): Use it to compute INPUTS.

* tests/packages.scm (dummy-package): New macro.
  ("package-transitive-inputs"): New test.

* distro/base.scm (guile-2.0): New variable.

* guix/build/gnu-build-system.scm (set-paths): Add `PKG_CONFIG_PATH'.

* distro/base.scm (lout): New variable.

* guix/build-system/gnu.scm (gnu-build): Add `tests?' parameter.
  [builder]: Inherit it.

* guix/build/utils.scm (substitute): Restore FILE's mode before renaming
  TEMPLATE.

* guix/build/utils.scm (substitute): Change to accept a `pattern+procs'
  parameter.  Iterate over it.
  (substitute*): Adjust accordingly.

* distro/base.scm (guile-1.8): Adjust accordingly.

* distro/base.scm (gawk): Explicitly disable parallel tests.

* guix-build.in (leave): New macro, formerly in `guix-build'.
  (show-help): Document `--cores'.
  (%options): Add `--cores'.
  (guix-build): Remove `leave' macro from here.  Pass the `cores' option
  value to `set-build-options'.

* guix/build/gnu-build-system.scm (build): Add `parallel-build?'
  parameter; honor it and $NIX_BUILD_CORES.
  (check): Add `parallel-tests?' parameter; likewise.

* guix/build-system/gnu.scm (gnu-build): Add `parallel-build?' and
  `parallel-tests?' parameters.
  [builder]: Inherit them.

* guix/build/utils.scm (let-matches, substitute*): New macros.

* distro/base.scm (guile-1.8): Use `substitute*' instead of
  `substitute'.  Remove the #:modules argument.

* distro/base.scm (guile-1.8): New variable.

* distro/guile-1.8-cpp-4.5.patch: New file.
* Makefile.am (nobase_dist_guilemodule_DATA): Add it.

* guix/build/utils.scm (substitute): Close OUT before renaming it.

* guix/build/gnu-build-system.scm (set-paths): Dump the value of
  environment variables in the `environment-variables' files, similar to
  what Nixpkgs does.

* guix/packages.scm (package-derivation): Add to the store inputs that
  are local files.

* guix/build/gnu-build-system.scm (patch): New procedure.
  (%standard-phases): Add `patch'.

* guix/build-system/gnu.scm (gnu-build): Add `patches' and `patch-flags'
  parameters.  Pass them on.

* guix/build-system/gnu.scm (gnu-build): Add a `modules' keyword
  parameter; use it.

* guix/build/utils.scm (with-directory-excursion): New macro.
  (alist-cons-before, alist-cons-after, alist-replace): New procedures.
  (substitute): New procedure.

* tests/build-utils.scm: New file.

* Makefile.am (TESTS): Add `tests/build-utils.scm'.

* guix/packages.scm (<package>)[self-native-input?]: New field.
  (package-derivation): Update/fix pattern.

* guix/packages.scm (<package-source>): Rename to...
  (<origin>): ... this.  Update users.

* distro/base.scm (libsigsegv, gawk, hello): Adjust to renaming; refer
  to VERSION to build the URL.

* guix/utils.scm (define-record-type*)[make-syntactic-constructor]: Bind
  all the ((FIELD VALUE) ...) in a `letrec*'.  Adjust `field-value'
  accordingly.

* tests/utils.scm ("define-record-type* with letrec* behavior"): New
  test.

* guix/packages.scm (base32): New macro.

* distro/base.scm (libsigsegv, gawk, hello): Use it.

* guix/packages.scm (package-derivation): When ARGS is a procedure, call
  (ARGS SYSTEM).

* distro/base.scm (gawk)[arguments]: Turn into a procedure, to disable
  tests on Cygwin.

* guix/build/gnu-build-system.scm (configure): Print the final list of
  flags.
  (check): Add `tests?' keyword parameter.

* guix/build/gnu-build-system.scm (configure): Print CONFIGURE-FLAGS.

* guix/utils.scm (define-record-type*): In case of missing or extra
  field initializers, raise a descriptive `syntax-error'.

* distro/base.scm (libsigsegv)[outputs]: New field
  (gawk)[arguments]: Clear.
  [inputs]: Add the "lib" output of LIBSIGSEGV.

* guix-build.in (guix-build): Display multiple outputs when there's more
  than one.

* guix/derivations.scm (write-derivation)[coalesce-duplicate-inputs]:
  New procedure.
  Use it to process INPUTS.

* tests/derivations.scm ("user of multiple-output derivation"): New
  test.

* Makefile.am (TESTS_ENVIRONMENT): Add `--no-auto-compile'.

* guix/build/gnu-build-system.scm (configure): Change `--libdir' and
  `--includedir' to LIBDIR + "/lib" and INCLUDEDIR + "/include",
  respectively.