gnu: Add ocaml-graph.

* gnu/packages/ocaml.scm (ocaml-graph): New variable.
* gnu/packages/patches/ocaml-graph-honor-source-date-epoch.patch: New
file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -894,6 +894,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/ocaml-CVE-2015-8869.patch		\
   %D%/packages/patches/ocaml-Add-a-.file-directive.patch	\
   %D%/packages/patches/ocaml-findlib-make-install.patch	\
+  %D%/packages/patches/ocaml-graph-honor-source-date-epoch.patch	\
   %D%/packages/patches/omake-fix-non-determinism.patch	\
   %D%/packages/patches/ola-readdir-r.patch			\
   %D%/packages/patches/openscenegraph-ffmpeg3.patch             \

gnu/packages/ocaml.scm

@@ -3391,6 +3391,33 @@ unique identifiers (UUIDs) version 3, 5 (named based with MD5, SHA-1 hashing)
 and 4 (random based) according to RFC 4122.")
     (license license:isc)))
 
+(define-public ocaml-graph
+  (package
+    (name "ocaml-graph")
+    (version "1.8.7")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://ocamlgraph.lri.fr/download/"
+                                  "ocamlgraph-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1845r537swjil2fcj7lgbibc2zybfwqqasrd2s7bncajs83cl1nz"))
+              (patches (search-patches "ocaml-graph-honor-source-date-epoch.patch"))))
+    (build-system ocaml-build-system)
+    (arguments
+     `(#:install-target "install-findlib"
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'set-shell
+           (lambda* (#:key inputs #:allow-other-keys)
+             (setenv "CONFIG_SHELL" (string-append (assoc-ref inputs "bash")
+                                                   "/bin/sh")))))))
+    (inputs `(("lablgtk" ,lablgtk)))
+    (home-page "http://ocamlgraph.lri.fr/")
+    (synopsis "Graph library for OCaml")
+    (description "OCamlgraph is a generic graph library for OCaml.")
+    (license license:lgpl2.1)))
+
 (define-public coq-flocq
   (package
     (name "coq-flocq")

gnu/packages/patches/ocaml-graph-honor-source-date-epoch.patch

@@ -0,0 +1,34 @@
+From 354ef78aac0b887fae3c10b28eb2b0d83f66bdfe Mon Sep 17 00:00:00 2001
+From: Julien Lepiller <julien@lepiller.eu>
+Date: Mon, 2 Jan 2017 17:05:24 +0100
+Subject: [PATCH] Honor SOURCE_DATE_EPOCH
+
+---
+ Makefile.in | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/Makefile.in b/Makefile.in
+index a32b4b8..ef4c174 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -113,11 +113,16 @@ graph.cmx: $(CMI) $(CMX)
+	$(OCAMLOPT) $(INCLUDES) -pack -o $@ $^
+ 
+ VERSION=1.8.7
++ifdef SOURCE_DATE_EPOCH
++BUILD_DATE=$(shell date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date)
++else
++BUILD_DATE=$(shell date)
++endif
+ 
+ src/version.ml: Makefile
+	rm -f $@
+	echo "let version = \""$(VERSION)"\"" > $@
+-	echo "let date = \""`date`"\"" >> $@
++	echo "let date = \""$(BUILD_DATE)"\"" >> $@
+ 
+ # gtk2 graph editor
+ ###################
+-- 
+2.11.0
+