gnu: Add libelf.

* gnu/packages/gcc.scm (libelf): New variable.

gnu/packages/gcc.scm

@@ -211,3 +211,31 @@ matters.  While the user has full control on generated code quality,
 CLooG is designed to avoid control overhead and to produce a very
 effective code.")
     (license gpl2+)))
+
+(define-public libelf
+  (package
+    (name "libelf")
+    (version "0.8.13")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "http://www.mr511.de/software/libelf-"
+                                 version ".tar.gz"))
+             (sha256
+              (base32
+               "0vf7s9dwk2xkmhb79aigqm0x0yfbw1j0b9ksm51207qwr179n6jr"))))
+    (build-system gnu-build-system)
+    (arguments '(#:phases (alist-replace
+                           'configure
+                           (lambda* (#:key outputs #:allow-other-keys)
+                             ;; This old `configure' script doesn't support
+                             ;; variables passed as arguments.
+                             (let ((out (assoc-ref outputs "out")))
+                               (setenv "CONFIG_SHELL" (which "bash"))
+                               (zero?
+                                (system* "./configure"
+                                         (string-append "--prefix=" out)))))
+                           %standard-phases)))
+    (home-page "http://www.mr511.de/software/english.html")
+    (synopsis "An ELF object file access library")
+    (description "libelf is a C library to access ELF object files.")
+    (license lgpl2.0+)))