* gnu/packages/photo.scm (enblend-enfuse): New variable.

* gnu/packages/ebook.scm (calibre): Update to 2.37.1.

* gnu/packages/maths.scm (flann): New variable.

* gnu/packages/video.scm (youtube-dl): Update to 2015.09.03.

* gnu/packages/photo.scm (libpano13): New variable.

Reported by Mathieu Lirzin <mathieu.lirzin@etu.u-bordeaux.fr>
at <https://lists.gnu.org/archive/html/guix-devel/2015-09/msg00111.html>.

* guix/ui.scm (P_): Check whether MSGID is empty, and return it if it is.

* gnu/packages/ruby.scm (ruby-ox): New variable.

* gnu/packages/ruby.scm (ruby-activesupport): New variable.

* gnu/packages/ruby.scm (ruby-json): New variable.

* gnu/packages/ruby.scm (ruby-tzinfo): New variable.

* gnu/packages/ruby.scm (ruby-thread-safe): New variable.

* gnu/packages/ruby.scm (ruby-pry): New variable.

* gnu/packages/ruby.scm (ruby-slop-3): New variable.

* gnu/packages/ruby.scm (ruby-coderay): New variable.

* gnu/packages/ruby.scm (ruby-method-source): New variable.

* gnu/packages/libcanberra.scm (sound-theme-freedesktop)[license]:
  Specify the actual licenses that apply.

* guix/licenses.scm (cc-by-sa4.0, cc-by3.0): New variables.

* gnu/packages/bootstrap.scm (package-from-tarball)[license]: Set to
  GPL3+.
* gnu/packages/make-bootstrap.scm (%static-binaries)[license]:
  Likewise.

* guix/scripts/lint.scm (check-license): New procedure.
  (%checkers): Add 'license' checker.
* tests/lint.scm ("license: invalid license"): New test.

* gnu/packages/statistics.scm (r-stringr)[home-page]: Set to valid URL.

* guix/build/emacs-build-system.scm (move-doc): Adjust to use
  "/share/info" instead of its sub-directory.

* gnu/packages/admin.scm (wpa-supplicant-light): Rename to ...
  (wpa-supplicant-minimal): ...this.
  (wpa-supplicant): Use it.
* gnu/system/install.scm (installation-os): Use it.

* gnu/packages/fonts.scm (font-anonymous-pro): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

Co-Authored-By: Pjotr Prins <pjotr.public01@thebird.nl>

* gnu/packages/ruby.scm (ruby-nokogiri): New variable.

* gnu/packages/ruby.scm (ruby-mini-portile): New variable.

* gnu/packages/ruby.scm (ruby-minitar): New variable.

* tests/derivations.scm ("substitutable-derivation?",
  "derivation-prerequisites-to-build and substitutes, local build"): Fix
  harmless typos.

* guix/download.scm (url-fetch): Use #:local-build? #t.
* guix/git-download.scm (git-fetch): Likewise.

* guix/build/syscalls.scm (clone): Catch -1 return value and throw error.

* gnu/packages/geeqie.scm: Import all of (gnu packages ghostscript) instead
  of selectively only the lcms variable; this helps resolve problems with
  circular dependencies when including the module.

* gnu/packages/image.scm (libtiff)[home-page]: Update.

* gnu/packages/image.scm (vigra)[inputs]: Add ilmbase and openexr.
  [arguments]: Augment #:configure-flags.

* gnu/packages/photo.scm: Order module imports alphabetically.

* gnu/packages/photo.scm: Import (guix licenses) with #:prefix license: to
  avoid an impending clash with the import of zlib from both (guix licenses)
  and (gnu packages compression).

* gnu/packages/package-management.scm (guix-devel): Delete
  'disable-container-tests' build phase.

Reported by Andy Wingo <wingo@igalia.com>.

* guix/monads.scm (define-lift) <fallback case>: Add missing #'.  Remove
  extra formal parameter.
* tests/monads.scm ("lift"): Add test with 'lift1' as a procedure.

* gnu/packages/patchutils.scm (patches): New variables.

* gnu/packages/mail.scm (python2-notmuch): New variable.

* gnu/packages/firmware.scm (ath9k-htc-firmware): Update to 1.4.0.