gnu: Add protozero.

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

gnu/packages/geo.scm

@@ -24,6 +24,7 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu packages geo)
+  #:use-module (guix build-system cmake)
   #:use-module (guix build-system glib-or-gtk)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system go)
@@ -850,3 +851,26 @@ to create databases that are optimized for rendering/tile/map-services.")
                license:expat
                license:bsd-2
                license:bsd-3))))
+
+(define-public protozero
+  (package
+    (name "protozero")
+    (version "1.6.3")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (string-append "https://github.com/mapbox/protozero/archive/v"
+                            version ".tar.gz"))
+    (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "1xaj4phz1r7xn0vgdfvfkz8b0bizgb6mavjky1zqcvdmbwgwgly5"))))
+    (build-system cmake-build-system)
+    (home-page "https://github.com/mapbox/protozero")
+    (synopsis "Minimalistic protocol buffer decoder and encoder in C++")
+    (description "Protozero is a minimalistic protocol buffer decored and
+encoder in C++.  The developer using protozero has to manually translate the
+@file{.proto} description into code.")
+    (license (list
+               license:asl2.0; for folly
+               license:bsd-2))))