gnu: Add libmaxminddb.

* gnu/packages/geo.scm (libmaxminddb): New variable.

gnu/packages/geo.scm

@@ -10,6 +10,7 @@
 ;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
 ;;; Copyright © 2019 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2019 Wiktor Żelazny <wzelazny@vurv.cz>
+;;; Copyright © 2019 Hartmut Goebel <h.goebel@crazy-compilers.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1213,3 +1214,33 @@ (define-public josm
 sources as well as from online sources and allows to edit the OSM data (nodes,
 ways, and relations) and their metadata tags.")
     (license license:gpl2+)))
+
+(define-public libmaxminddb
+  (package
+    (name "libmaxminddb")
+    (version "1.4.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://github.com/maxmind/libmaxminddb"
+                           "/releases/download/" version "/"
+                           "/libmaxminddb-" version ".tar.gz"))
+       (sha256
+        (base32 "0mnimbaxnnarlw7g1rh8lpxsyf7xnmzwcczcc3lxw8xyf6ljln6x"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'set-cc-to-gcc
+           (lambda _
+             (setenv "CC" "gcc"))))))
+    (native-inputs
+     `(("perl" ,perl)))
+    (home-page "https://maxmind.github.io/libmaxminddb/")
+    (synopsis "C library for the MaxMind DB file format")
+    (description "The libmaxminddb library provides a C library for reading
+MaxMind DB files, including the GeoIP2 databases from MaxMind.  The MaxMind DB
+format is a custom, but open, binary format designed to facilitate fast
+lookups of IP addresses while allowing flexibility in the type of data
+associated with an address.")
+    (license license:asl2.0)))