gnu: Add libexif, libgphoto2, and gphoto2.

* gnu/packages/photo.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -156,6 +156,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/pdf.scm				\
   gnu/packages/pem.scm				\
   gnu/packages/perl.scm				\
+  gnu/packages/photo.scm			\
   gnu/packages/pkg-config.scm			\
   gnu/packages/plotutils.scm			\
   gnu/packages/popt.scm				\

gnu/packages/photo.scm

@@ -0,0 +1,121 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; 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 photo)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages libusb)
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages readline)
+  #:use-module (gnu packages popt)
+  #:use-module ((gnu packages base) #:select (tzdata)))
+
+(define-public libexif
+  (package
+    (name "libexif")
+    (version "0.6.21")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/libexif/libexif-"
+                                  version ".tar.bz2"))
+              (sha256
+               (base32
+                "06nlsibr3ylfwp28w8f5466l6drgrnydgxrm4jmxzrmk5svaxk8n"))))
+    (build-system gnu-build-system)
+    (home-page "http://libexif.sourceforge.net/")
+    (synopsis "Read and manipulate EXIF data in digital photographs")
+    (description
+     "The libexif C library allows applications to read, edit, and save EXIF
+data as produced by digital cameras.")
+    (license lgpl2.1+)))
+
+(define-public libgphoto2
+  (package
+    (name "libgphoto2")
+    (version "2.5.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/gphoto/libgphoto2-"
+                                  version ".tar.bz2"))
+              (sha256
+               (base32
+                "0f1818l1vs5fbmrihzyv3qasddbqi3r01jik5crrxddwalsi2bd3"))))
+    (build-system gnu-build-system)
+    (native-inputs `(("pkg-config" ,pkg-config)))
+    (inputs
+     `(;; ("libjpeg-turbo" ,libjpeg-turbo)
+       ("libtool" ,libtool)
+       ("libusb" ,libusb)))
+    (propagated-inputs
+     `(;; The .pc refers to libexif.
+       ("libexif" ,libexif)))
+    (home-page "http://www.gphoto.org/proj/libgphoto2/")
+    (synopsis "Accessing digital cameras")
+    (description
+     "This is the library backend for gphoto2.  It contains the code for PTP,
+MTP, and other vendor specific protocols for controlling and transferring data
+from digital cameras.")
+
+    ;; 'COPYING' says LGPLv2.1+, but in practices files are under LGPLv2+.
+    (license lgpl2.1+)))
+
+(define-public gphoto2
+  (package
+    (name "gphoto2")
+    (version "2.5.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/gphoto/gphoto2-"
+                                  version ".tar.bz2"))
+              (sha256
+               (base32
+                "16c8k1cxfypg7v5h8xi87grclw7a5ayaamn548ys3zkj727r5fcf"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (inputs
+     `(("readline" ,readline)
+       ;; ("libjpeg-turbo" ,libjpeg-turbo)
+       ("popt" ,popt)
+       ("libexif" ,libexif)
+       ("libgphoto2" ,libgphoto2)))
+    (arguments
+     '(#:phases (alist-cons-before
+                 'check 'pre-check
+                 (lambda* (#:key inputs #:allow-other-keys)
+                   (substitute* (find-files "tests/data" "\\.param$")
+                     (("/usr/bin/env")
+                      (which "env"))))
+                 %standard-phases)
+
+       ;; FIXME: There are 2 test failures, most likely related to the build
+       ;; environment.
+       #:tests? #f))
+
+    (home-page "http://www.gphoto.org/")
+    (synopsis "Command-line tools to access digital cameras")
+    (description
+     "Gphoto2 is a set of command line utilities for manipulating a large
+number of different digital cameras.  Through libgphoto2, it supports PTP,
+MTP, and much more.")
+
+    ;; Files are typically under LGPLv2+, but 'COPYING' says GPLv2+.
+    (license gpl2+)))