* guix/zlib.scm, tests/zlib.scm: New files.
* Makefile.am (MODULES): Add guix/zlib.scm.
(SCM_TESTS): Add tests/zlib.scm.
* m4/guix.m4 (GUIX_LIBGCRYPT_LIBDIR): New macro.
* configure.ac (LIBGCRYPT_LIBDIR): Use it.  Define and substitute
'LIBZ'.
* guix/config.scm.in (%libz): New variable.

Suggested by Tobias Geerinckx-Rice <me@tobias.gr>.

* gnu/services/shepherd.scm (assert-valid-graph)[assert-satisfied-requirements]:
Clarify error message.

* gnu/packages/algebra.scm (giac-xcas): Update to 1.2.2-75.

This reverts commit 1d14bf9f.

* gnu/packages/patches/gd-fix-test-on-i686.patch: New file.
* gnu/local.mk (dist_PATCH_DATA): Add it.
* gnu/packages/gd.scm (gd)[source]: Add the patch.

* gnu/packages/patches/gnutls-fix-stale-test.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/tls.scm (gnutls)[replacement]: New field.
(gnutls/fixed): New variable.

* gnu/packages/freedesktop.scm (libinput): Update to 1.4.0.

* gnu/packages/enlightenment.scm (efl)[arguments]: Use 'modify-phases'.

* gnu/packages/enlightenment.scm (efl)[inputs]: Remove valgrind.

* gnu/packages/gstreamer.scm (python-gst): Update to 1.8.2.

* gnu/packages/gstreamer.scm (gst-libav): Update to 1.8.2.

* gnu/packages/gstreamer.scm (gst-plugins-ugly): Update to 1.8.2.

* gnu/packages/gstreamer.scm (gst-plugins-good): Update to 1.8.2.

* gnu/pakcages/gstreamer.scm (gst-plugins-base): Update to 1.8.2.

* gnu/packages/gstreamer.scm (gstreamer): Update to 1.8.2.

Suggested by Thomas Danckaert <thomas.danckaert@gmail.com>.

* etc/guix-daemon.service.in (Environment): New value.

* gnu/tests/install.scm (%simple-installation-script): New variable.
Contains installation script formerly in 'run-install'.
(run-install): Add 'target-os', 'target-os-source', and #:script
parameters.  Honor them.
(qemu-command/writable-image): New procedure.
(%test-installed-os): Use it.

This allows mapped devices listed in 'dependencies' to be properly taken
into account.

Reported by Andreas Enge <andreas@enge.fr>.

* gnu/system.scm (mapped-device-user): Check whether DEVICE is a member
of the 'dependencies' of FS.
* tests/system.scm (%luks-device, %os-with-mapped-device): New variables.
("operating-system-user-mapped-devices")
("operating-system-boot-mapped-devices")
("operating-system-boot-mapped-devices, implicit dependency"): New tests.

* gnu/packages/compression.scm (xdelta): New variable.

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

* gnu/packages/bioinformatics.scm (diamond): Update to 0.8.15.

* gnu/packages/markdown.scm (hoedown): Update to 3.0.7.

* gnu/packages/stalonetray.scm (stalonetray): Update to 0.8.3.

* gnu/packages/python.scm (python-simplejson): Update to 3.8.2.
[source]: Use 'pypi-uri' format.

* gnu/packages/python.scm (behave): Update to 1.2.5.
[source]: Use 'pypi-uri' format.

* gnu/packages/python.scm (python-coverage): Update to 4.1.

* gnu/packages/bioinformatics.scm (eigensoft)[inputs]: Remove reference
  to non-existing "lapacke" output.

* gnu/packages/maths.scm (lapack)[arguments]: Add "-DLAPACKE=ON".

* gnu/packages/emacs.scm (emacs-solarized-theme): New variable.

* gnu/packages/emacs.scm (emacs-perspective): New variable.

* gnu/packages/emacs.scm (emacs-tagedit): New variable.

* gnu/packages/emacs.scm (emacs-shell-switcher): New variable.

* gnu/packages/emacs.scm (emacs-undercover): New variable.

* gnu/packages/emacs.scm (emacs-shut-up): New variable.

* gnu/packages/emacs.scm (emacs-smart-mode-line): New variable.

* gnu/packages/emacs.scm (emacs-rich-minority): New variable.

* gnu/packages/emacs.scm (emacs-skewer-mode): New variable.

* gnu/packages/emacs.scm (emacs-simple-httpd): New variable.

* gnu/packages/emacs.scm (emacs-page-break-lines): New variable.

* gnu/packages/emacs.scm (emacs-paren-face): New variable.