* guix/import/github.scm (latest-released-version): Use any and cond instead
of a recursive loop and an if-else ladder respectively.

* guix/import/github.scm (latest-released-version): Use preleases when package
has no releases.

* gnu/packages/virtualization.scm (xen): Update comments.

* gnu/packages/virtualization.scm (xen)[arguments]<#:phases>[patch]:
Don't patch etherboot's "Makefile".

When trying to convert a PDF to EPUB, the following error occurs:

File "/gnu/store/kz6bgqw9z7akj11zh20wkx14cgq0s3n2-calibre-3.35.0/lib/calibre/calibre/ebooks/pdf/pdftohtml.py", line 76, in pdftohtml
    _('Could not find pdftohtml, check it is in your PATH'))

Hardcode pdftohtml binary path by patching pdftohtml.py.

* gnu/packages/ebook.scm (calibre)[arguments]: Patch pdftohtml.py in
'configure phase to set hardcode pdftohtml binary path.

* gnu/packages/moreutils.scm (moreutils): Update to 0.63.
[arguments]: All phases return #t.

* gnu/packages/perl.scm (perl-module-scandeps): Update to 1.27.

* gnu/packages/perl.scm (perl-json): Update to 4.01.
[source]: Update source uri.

* gnu/packages/perl.scm (perl-json-xs): Update to 4.0.
[native-inputs]: Add perl-canary-stability.

* gnu/packages/perl.scm (perl-file-remove): Update to 1.58.
[description]: Texify the description.

* gnu/packages/perl.scm (perl-file-homedir): Update to 1.004.

* gnu/packages/perl.scm (perl-file-which): Update to 1.23.
[source]: Update source uri.
[home-page]: Update to new home-page.

* gnu/packages/perl.scm (perl-file-slurp): Update to 9999.25.
[source]: Update source uri.

* gnu/packages/perl.scm (perl-text-template): Update to 1.54.
[native-inputs]: Add perl-test-more-utf8, perl-test-warnings.

* gnu/packages/perl-check.scm (perl-test-more-utf8): New variable.

Previously execution of the trampoline would be somewhat sensitive to
GUILE_LOAD_PATH & co., for example.

* build-aux/build-self.scm (build-program): Remove 'unsetenv' call and
%LOAD-COMPILED-PATH hack.
(call-with-clean-environment): New procedure.
(with-clean-environment): New macro.
(build): Wrap 'open-pipe*' call in 'with-clean-environment'.

* gnu/ci.scm (system-test-jobs): Return the empty list when SYSTEM is
"armhf-linux".

Follow-up to 35e8900d.

* gnu/packages/virtualization.scm (xen): Update comment.

* gnu/packages/virtualization.scm (xen): New variable.

* .mailmap: Add my email.

* TODO (Installer): Add Pierre Neidhardt suggestions described here:
  https://lists.gnu.org/archive/html/guix-devel/2019-01/msg00305.html

* gnu/packages/messaging.scm (gajim): Update to 1.1.2.

* gnu/packages/messaging.scm (python-nbxmpp): Update to 0.6.9.

* gnu/packages/xorg.scm (xcursorgen): Update to 1.0.7.

* gnu/packages/virtualization.scm (umoci): Update to 0.4.3.

* gnu/packages/video.scm (vlc): Update to 3.0.6.

* gnu/packages/xml.scm (perl-xml-compile): Update to 1.61.

Fixes <https://bugs.gnu.org/34136>.
Reported by Pierre Neidhardt <mail@ambrevar.xyz>.

Fixes wrong-type-arg crash of "guix pull -p /does-not-exist -l".

* guix/scripts/pull.scm: Use (srfi srfi-34).

* guix/self.scm (compiled-guix)[*system-modules*]: Remove gnu/tests/*
from #:extra-files.
[*system-test-modules*]: New variable.
[build-modules]: Add them.

* gnu/packages/python-xyz.scm (python-cysignals, python2-cysignals):
Update to 1.9.0.

* gnu/packages/games.scm (freedink-data): Update to 1.08.20190120.

* gnu/packages/games.scm (freedink-dfarc)[properties]: New field.

* gnu/packages/games.scm (freedink-data)[properties]: New field.

* gnu/packages/games.scm (freedink-engine)[properties]: New field.

This fixes a regression introduced in 9a5091d0
whereby packages with git origin URIs not hosted on GitHub would be wrongly
detected as being covered under the github updater.
Reported by Efraim Flashner <efraim@flashner.co.il>.

* guix/import/github.scm (updated-github-url): Check if git URIs are GitHub
URIs.

* gnu/packages/animation.scm (pencil2d): New variable.

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

* gnu/packages/audio.scm (qjackctl)[arguments]: Pass "--disable-xunique" to
configure-flags.

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

* guix/channels.scm (latest-channel-instances): Use 'fold2' instead of
'fold'.

* guix/channels.scm (channel-instance-derivations): Raise an '&message'
condition when CORE-INSTANCE is #f.

This ensures that channel modules are compiled with the right Guile,
that they get to see the right modules, and so on.  IOW, it avoids bugs
such as those addressed by commits
3c0e1639 and
cb341c12.

* guix/channels.scm (standard-module-derivation): Add 'core'
parameter.  Rewrite in terms of 'gexp->derivation-in-inferior'.
(build-from-source): Add #:core parameter and pass it to
'standard-module-derivation'.
(build-channel-instance): Add 'core' parameter and pass it on.
(channel-instance-derivations)[dependencies]: Remove.
Adjust 'build-channel-instance' call.