gnu: Add log4cpp.

* gnu/packages/logging.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

gnu/local.mk

@@ -211,6 +211,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/lisp.scm				\
   %D%/packages/llvm.scm				\
   %D%/packages/lout.scm				\
+  %D%/packages/logging.scm			\
   %D%/packages/lsh.scm				\
   %D%/packages/lsof.scm				\
   %D%/packages/lua.scm				\

gnu/packages/logging.scm

@@ -0,0 +1,47 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages logging)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages))
+
+(define-public log4cpp
+  (package
+    (name "log4cpp")
+    (version "1.1.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/log4cpp/log4cpp-"
+                                  (version-major+minor version) ".x%20%28new%29"
+                                  "/log4cpp-" (version-major+minor version)
+                                  "/log4cpp-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1l5yz5rfzzv6g3ynrj14mxfsk08cp5h1ssr7d74hjs0accrg7arm"))))
+    (build-system gnu-build-system)
+    (synopsis "Log library for C++")
+    (description
+     "Log4cpp is library of C++ classes for flexible logging to files, syslog,
+IDSA and other destinations.  It is modeled after the Log4j Java library,
+staying as close to their API as is reasonable.")
+    (home-page "http://log4cpp.sourceforge.net/")
+    (license license:lgpl2.1+)))