gnu: guile-json: Install under .../site/2.0.

* gnu/packages/guile.scm (guile-json)[source]: Add 'snippet'.

gnu: Add guile-json.

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

Merge branch 'core-updates'

gnu: guile: Upgrade to 2.0.11.

* gnu/packages/guile.scm (guile): Upgrade to 2.0.11.

gnu: guile: Upgrade to 2.0.10.

* gnu/packages/guile.scm (guile-2.0): Upgrade to 2.0.10.

gnu: Make libgc 7.4 the default.

* gnu/packages/bdw-gc.scm (libgc): Rename to...
  (libgc-7.2): ... this.
  (libgc-7.4): Rename to...
  (libgc): ... this.
* gnu/packages/guile.scm (guile-2.0): Switch to LIBGC.
  (guile-2.0/fixed): Alias GUILE-2.0.

Merge branch 'master' into core-updates

gnu: guile-2.0: Switch to libgc 7.4.0.

* gnu/packages/guile.scm (guile-2.0): Use LIBGC-7.4.
  (guile-2.0/fixed): Keep using LIBGC.

gnu: gnu-build-system: Add CC_FOR_BUILD to configure flags.

* guix/build/gnu-build-system.scm: Add new configure flag: CC_FOR_BUILD=gcc

* gnu/packages/gnupg.scm, gnu/packages/guile.scm, gnu/packages/make-bootstrap.scm:
  remove CC_FOR_BUILD from these package descriptions.

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

gnu: Move 'guile-ssh' to (gnu packages ssh).

Reported by John Darrington <john@darrington.wattle.id.au>.

* gnu/packages/guile.scm (guile-ssh): Move to...
* gnu/packages/ssh.scm (guile-ssh): ... here.  New variable.
  This fixes a circular dependency issue, as reported at
  <https://lists.gnu.org/archive/html/guix-devel/2013-12/msg00024.html>.

gnu: Add Guile-SSH.

* gnu/packages/guile.scm (guile-ssh): New variable.

gnu: Synchronize descriptions with 'gnumaint'.

Synchronize package descriptions with the Womb.

* gnu/packages/algebra.scm,
  gnu/packages/aspell.scm,
  gnu/packages/autotools.scm,
  gnu/packages/base.scm,
  gnu/packages/bash.scm,
  gnu/packages/bison.scm,
  gnu/packages/cdrom.scm,
  gnu/packages/cflow.scm,
  gnu/packages/compression.scm,
  gnu/packages/cpio.scm,
  gnu/packages/cppi.scm,
  gnu/packages/ddrescue.scm,
  gnu/packages/dejagnu.scm,
  gnu/packages/ed.scm,
  gnu/packages/emacs.scm,
  gnu/packages/fdisk.scm,
  gnu/packages/freeipmi.scm,
  gnu/packages/gawk.scm,
  gnu/packages/gcal.scm,
  gnu/packages/gcc.scm,
  gnu/packages/gdb.scm,
  gnu/packages/gdbm.scm,
  gnu/packages/gettext.scm,
  gnu/packages/ghostscript.scm,
  gnu/packages/global.scm,
  gnu/packages/gnunet.scm,
  gnu/packages/gnupg.scm,
  gnu/packages/gnutls.scm,
  gnu/packages/gperf.scm,
  gnu/packages/gprolog.scm,
  gnu/packages/groff.scm,
  gnu/packages/grub.scm,
  gnu/packages/gsasl.scm,
  gnu/packages/guile.scm,
  gnu/packages/gv.scm,
  gnu/packages/help2man.scm,
  gnu/packages/idutils.scm,
  gnu/packages/indent.scm,
  gnu/packages/less.scm,
  gnu/packages/libidn.scm,
  gnu/packages/libsigsegv.scm,
  gnu/packages/libunistring.scm,
  gnu/packages/lightning.scm,
  gnu/packages/linux.scm,
  gnu/packages/lsh.scm,
  gnu/packages/m4.scm,
  gnu/packages/mail.scm,
  gnu/packages/maths.scm,
  gnu/packages/multiprecision.scm,
  gnu/packages/nano.scm,
  gnu/packages/ncurses.scm,
  gnu/packages/nettle.scm,
  gnu/packages/ocrad.scm,
  gnu/packages/oggvorbis.scm,
  gnu/packages/parted.scm,
  gnu/packages/plotutils.scm,
  gnu/packages/pth.scm,
  gnu/packages/readline.scm,
  gnu/packages/recutils.scm,
  gnu/packages/rush.scm,
  gnu/packages/scheme.scm,
  gnu/packages/screen.scm,
  gnu/packages/shishi.scm,
  gnu/packages/smalltalk.scm,
  gnu/packages/system.scm,
  gnu/packages/texinfo.scm,
  gnu/packages/time.scm,
  gnu/packages/unrtf.scm,
  gnu/packages/version-control.scm,
  gnu/packages/wdiff.scm,
  gnu/packages/wget.scm,
  gnu/packages/which.scm,
  gnu/packages/xnee.scm,
  gnu/packages/zile.scm: Change value of the 'description' field to that
  of the Womb.

gnu: Use the 'patches' field of <origin>.

* gnu/packages/apr.scm,
  gnu/packages/autotools.scm,
  gnu/packages/avahi.scm,
  gnu/packages/cdrom.scm,
  gnu/packages/cmake.scm,
  gnu/packages/cpio.scm,
  gnu/packages/cross-base.scm,
  gnu/packages/emacs.scm,
  gnu/packages/flex.scm,
  gnu/packages/fontutils.scm,
  gnu/packages/glib.scm,
  gnu/packages/grub.scm,
  gnu/packages/guile.scm,
  gnu/packages/idutils.scm,
  gnu/packages/libevent.scm,
  gnu/packages/linux.scm,
  gnu/packages/mail.scm,
  gnu/packages/make-bootstrap.scm,
  gnu/packages/mp3.scm,
  gnu/packages/oggvorbis.scm,
  gnu/packages/pdf.scm,
  gnu/packages/plotutils.scm,
  gnu/packages/qemu.scm,
  gnu/packages/recutils.scm,
  gnu/packages/rush.scm,
  gnu/packages/scheme.scm,
  gnu/packages/system.scm,
  gnu/packages/tcsh.scm,
  gnu/packages/valgrind.scm,
  gnu/packages/vpn.scm,
  gnu/packages/w3m: Use the 'patches' field of <origin> instead of
  adding a patch as input plus using #:patches.

Merge branch 'master' into core-updates

gnu: Add Guile-Lib.

* gnu/packages/guile.scm (guile-lib): New variable.

gnu: guile-ncurses: Install modules under .../site/2.0.

* gnu/packages/guile.scm (guile-ncurses): Append /2.0 to `guilesitedir'.

Merge branch 'core-updates'

gnu: Add a "debug" output for some packages.

* gnu/packages/base.scm (coreutils, gnu-make, glibc): Add a "debug" output.
* gnu/packages/bdw-gc.scm (libgc): Likewise.
* gnu/packages/guile.scm (guile-2.0): Likewise.
* gnu/packages/libffi.scm (libffi): Likewise.
* gnu/packages/multiprecision.scm (gmp, mpfr, mpc): Likewise.

utils: `set-path-environment-variable' calls `unsetenv' for empty values.

* guix/build/utils.scm (set-path-environment-variable): When VALUE is
  the empty string, call `unsetenv' instead of `setenv'.
* gnu/packages/guile.scm (guile-2.0)[arguments]: Remove `unsetenv'
  trick.