* doc/guix.texi (Defining Packages): Add 'arguments' field in the
  example; update 'synopsis' and 'description'.  Remove most of the
  description of 'build-system', and instead reference to the "Build
  Systems" node.  Briefly describe 'arguments' field, and remove more
  elaborate description.  Add cross-reference to "Packaging Guidelines".
  (Build Systems): New node.
  (Packaging Guidelines): Mention '--log-file'.

* gnu/packages/patches/qemu-multiple-smb-shares.patch: Change
  "/nix/store" to "/gnu/store".

* gnu/packages/admin.scm (clusterssh): New variable

* gnu/packages/xorg.scm (perl-x11-protocol): New variable

* gnu/packages/tcl.scm (perl-tk): New variable

* gnu/packages/admin.scm (net-base): Upgrade to 5.2; use
  'mirror://debian'.

* gnu/packages/admin.scm (shadow)[source]: Use the git repo.

* gnu/packages/patches/libssh-CVE-2014-0017.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/ssh.scm (libssh-0.5): New variable.
  (guile-ssh): Use it.

* guix/ui.scm (call-with-error-handling): Change 'system-error' handler
  to display the error message as it was raised.

* gnu/packages/pdf.scm (xpdf)[arguments]: Add #:parallel-build? #f.

* gnu/packages/lsh.scm (lsh): Use READLINE-6.2 instead of READLINE.

* gnu/packages/gdb.scm (gdb): Disable tests.

* gnu/packages/patches/valgrind-glibc.patch: s/2.18/2.19/.

Fixes the creation of single-package profiles, reported by Ludovic Courtès.

* guix/build/union.scm (union-build): Add new internal procedure
  'union-of-directories' that always creates a directory, containing the code
  previously used only to merge multiple directories.  Call it from the
  multiple-directory case in 'union' and from the top-level 'union-build'.

* guix/pki.scm (write-acl): New procedure.
  (ensure-acl): Use it.  Fixes a regression introduced in 39831f16,
  whereby 'ensure-acl' would yield a wrong-type-arg error.
* guix/scripts/archive.scm (authorize-key): Use 'write-acl'.

* daemon.am (libformat_headers): Remove 6 nix/boost files that were
  removed in Nix commit 1c2550a2ae826c422cf6d34f1c5c3e687474929d.

* nix-upstream: Update.
* daemon.am (AM_CXXFLAGS): Add -std=c++0x.

* doc/guix.texi (Build Environment Setup): Adjust description of /dev
  and /proc; remove footnote about /dev/shm, now obsolete.

Before that, there was a small time window during which the GC could
wipe the .drv (before 'guix build' has been called), or the build
result (before 'retrieve-files' has started.)

* guix/scripts/offload.scm (remote-pipe): Add #:quote? parameter and
  honor it.
  (%gc-root-file): New variable.
  (register-gc-root, remove-gc-root): New procedures.
  (offload): Adjust comment.  Run 'guix build' with '-r %GC-ROOT-FILE'.
  (transfer-and-offload): Call 'register-gc-root' before
  sending (derivation-file-name DRV).  Call 'remove-gc-root' after the
  call to 'offload' or 'retrieve-files'.
  (send-files): Call 'remote-pipe' with #:quote? #f.
  (retrieve-files): Likewise.

* gnu/packages/readline.scm (readline-6.2): New variable.
* gnu/packages/parted.scm (parted): Use it instead of READLINE.

* gnu/packages/inkscape.scm (inkscape): Use LIBGC-7.2 instead of LIBGC.

* gnu/packages/python.scm (python-2): patch Lib/popen2.py to use /nix/.../sh.

* gnu/packages/global.scm (global): Upgrade to 6.2.12.

* gnu/packages/apl.scm (apl): Upgrade to 1.3.

* gnu/packages/cdrom.scm (xorriso): Upgrade to 1.3.6.pl01.

* gnu/packages/gxmessage.scm (gxmessage): Upgrade to 2.20.1.

* gnu/packages/help2man.scm (help2man): Upgrade to 1.45.1.

* gnu/packages/zile.scm (zile): Upgrade to 2.4.11.

* gnu/packages/maths.scm (units): Upgrade to 2.11.

* gnu/packages/freeipmi.scm (freeipmi): Upgrade to 1.4.1.

* gnu/packages/parallel.scm (parallel): Upgrade to 20140322.

* gnu/packages/xnee.scm (xnee): Upgrade to 3.18.

* gnu/packages/maths.scm (glpk): Upgrade to 4.54.

Fixes bug introduced in d4bf49b1.

* gnu/packages/texlive.scm (texlive): Change 'alist-replace' to
  'alist-cons-before'.

* tests/union.scm ("union-build with symlink to directory"): New test.

* guix/build/union.scm: Rewrite; only 'file=?' remains unchanged.  Remove
  'tree-union' and 'delete-duplicate-leaves' exports.  Merge inputs in a
  breadth-first fashion.  Follow symlinks for purposes of making decisions
  about the merge.

* tests/union.scm: Remove tests of 'tree-union' and 'delete-duplicate-leaves'.

Based on a patch by Dan Kennedy <danielk1977@gmail.com>.

* gnu/packages/patches/sqlite-large-page-size-fix.patch: New file.
* gnu/packages/sqlite.scm (sqlite): Add it.
* gnu-system.am (dist_patch_DATA): Add it.

* gnu/packages/sqlite.scm (sqlite): Upgrade to 3.8.4.2.

* gnu/packages/sqlite.scm (sqlite): Compute the numeric-version from the
  traditional version string, and use it to compute the source URL.

* gnu/packages/mail.scm (mutt): Upgrade to 1.5.23.  Add bitbucket
  source URL and try it first.