>From a73293cb66f3978e60e1244124cd28b623d6c30c Mon Sep 17 00:00:00 2001
From: Roel Janssen <address@hidden>
Date: Tue, 10 May 2016 15:55:52 +0200
Subject: [PATCH 2/2] gnu: graphviz: Add graphviz-guile.

* gnu/packages/graphviz.scm (graphviz): New variable.
---
 gnu/packages/graphviz.scm | 48 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/graphviz.scm b/gnu/packages/graphviz.scm
index 489a71c..f9c49ef 100644
--- a/gnu/packages/graphviz.scm
+++ b/gnu/packages/graphviz.scm
@@ -20,7 +20,9 @@
 (define-module (gnu packages graphviz)
   #:use-module (guix packages)
   #:use-module (guix build-system gnu)
+  #:use-module (guix build-system trivial)
   #:use-module (guix download)
+  #:use-module (gnu packages base)
   #:use-module (gnu packages xorg)
   #:use-module (gnu packages gtk)
   #:use-module (gnu packages xml)
@@ -34,7 +36,7 @@
   #:use-module (gnu packages compression)
   #:use-module (gnu packages gd)
   #:use-module (gnu packages swig)
-  #:use-module ((guix licenses) #:select (lgpl2.0+ epl1.0)))
+  #:use-module ((guix licenses) #:select (gpl3+ lgpl2.0+ epl1.0)))
 
 (define-public graphviz
   (package
@@ -111,6 +113,50 @@ software engineering, database and web design, machine learning, and in visual
 interfaces for other technical domains.")
     (license epl1.0)))
 
+(define-public graphviz-guile
+  (package
+    (name "graphviz-guile")
+    (version "1.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://github.com/roelj/graphviz-guile/archive/v"
+                    version ".tar.gz"))
+              (sha256
+               (base32 "1ccmr4isj85j7djg9m56n54rqq1z94bjmrrs6vv4qdcp6ihv3c3r"))
+              (file-name (string-append name "-" version ".tar.gz"))))
+    (build-system trivial-build-system)
+    (arguments
+     `(#:modules ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils))
+         (let ((tar (string-append (assoc-ref %build-inputs "tar") "/bin/tar"))
+               (PATH (string-append (assoc-ref %build-inputs "gzip") "/bin"))
+               (dest-dir (string-append %output "/share/guile/site/2.0"))
+               (gv (string-append (assoc-ref %build-inputs "graphviz")
+                                  "/lib/guile/2.0")))
+           (setenv "PATH" PATH)
+           (mkdir-p dest-dir)
+           (system* tar "xvf" (assoc-ref %build-inputs "source"))
+           (chdir "graphviz-guile-1.0")
+           ;; Use the absolute path to the graphviz library so that
+           ;; Guix can find it.
+           (substitute* "graphviz.scm"
+             (("libgv_guile.so") (string-append gv "/libgv_guile.so")))
+           (copy-file "graphviz.scm"
+                      (string-append dest-dir "/graphviz.scm"))))))
+    (native-inputs
+     `(("tar" ,tar)
+       ("gzip" ,gzip)))
+    (propagated-inputs
+     `(("graphviz" ,graphviz)))
+    (home-page "https://github.com/roelj/graphviz-guile")
+    (synopsis "Graphviz module for Guile")
+    (description "This package provides a Graphviz module file for Guile.  It
+uses the library provided by the Graphviz package.")
+    (license gpl3+)))
+
 (define-public gts
   (package
     (name "gts")
-- 
2.7.4