gnu: Add ocaml-findlib.

* gnu/packages/ocaml.scm (ocaml-findlib): New variable.
* gnu/packages/patches/ocaml-findlib-make-install.patch: New file.
* gnu-system.am (dist_patch_DATA): Register it.

gnu-system.am

@@ -624,6 +624,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/nvi-assume-preserve-path.patch		\
   gnu/packages/patches/nvi-dbpagesize-binpower.patch		\
   gnu/packages/patches/nvi-db4.patch				\
+  gnu/packages/patches/ocaml-findlib-make-install.patch	\
   gnu/packages/patches/openexr-missing-samples.patch		\
   gnu/packages/patches/openimageio-boost-1.60.patch		\
   gnu/packages/patches/openjpeg-CVE-2015-6581.patch		\

gnu/packages/ocaml.scm

@@ -4,6 +4,7 @@
 ;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2015 David Hashe <david.hashe@dhashe.com>
 ;;; Copyright © 2016 Eric Bavier <bavier@member.fsf.org>
+;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -42,6 +43,7 @@
   #:use-module (gnu packages lynx)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages python)
+  #:use-module (gnu packages m4)
   #:use-module (gnu packages ncurses)
   #:use-module (gnu packages version-control)
   #:use-module (gnu packages curl))
@@ -613,3 +615,52 @@ a collection of files and directories to be stored on different hosts
 brought up to date by propagating the changes in each replica
 to the other.")
     (license gpl3+)))
+
+(define-public ocaml-findlib
+  (package
+    (name "ocaml-findlib")
+    (version "1.6.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://download.camlcity.org/download/"
+                                  "findlib" "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "02abg1lsnwvjg3igdyb8qjgr5kv1nbwl4gaf8mdinzfii5p82721"))
+              (patches
+               (list (search-patch "ocaml-findlib-make-install.patch")))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("camlp4" ,camlp4)
+       ("m4" ,m4)
+       ("ocaml" ,ocaml)))
+    (arguments
+     `(#:tests? #f  ; no test suite
+       #:parallel-build? #f
+       #:make-flags (list "all" "opt")
+       #:phases (modify-phases %standard-phases
+                  (replace
+                   'configure
+                   (lambda* (#:key inputs outputs #:allow-other-keys)
+                     (let ((out (assoc-ref outputs "out")))
+                       (system*
+                        "./configure"
+                        "-bindir" (string-append out "/bin")
+                        "-config" (string-append out "/etc/ocamfind.conf")
+                        "-mandir" (string-append out "/share/man")
+                        "-sitelib" (string-append out "/lib/ocaml/site-lib")
+                        "-with-toolbox")))))))
+    (home-page "http://projects.camlcity.org/projects/findlib.html")
+    (synopsis "Management tool for OCaml libraries")
+    (description
+     "The \"findlib\" library provides a scheme to manage reusable software
+components (packages), and includes tools that support this scheme.  Packages
+are collections of OCaml modules for which metainformation can be stored.  The
+packages are kept in the filesystem hierarchy, but with strict directory
+structure.  The library contains functions to look the directory up that
+stores a package, to query metainformation about a package, and to retrieve
+dependency information about multiple packages.  There is also a tool that
+allows the user to enter queries on the command-line.  In order to simplify
+compilation and linkage, there are new frontends of the various OCaml
+compilers that can directly deal with packages.")
+    (license x11)))

gnu/packages/patches/ocaml-findlib-make-install.patch

@@ -0,0 +1,20 @@
+Ocaml wants to install its "core" libraries in OCAML_CORE_STDLIB.  That
+does not work in a store-based distribution.
+
+A solution was already provided by Nix
+
+    https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/ocaml/findlib/install_topfind.patch
+
+regenerated for Guix.
+
+--- findlib-1.5.3/src/findlib/Makefile	2014-09-16 13:21:46.000000000 +0200
++++ findlib-1.5.3/src/findlib/Makefile.new	2014-10-01 14:30:54.141082521 +0200
+@@ -89,7 +89,7 @@
+ install: all
+ 	mkdir -p "$(prefix)$(OCAML_SITELIB)/$(NAME)"
+ 	mkdir -p "$(prefix)$(OCAMLFIND_BIN)"
+-	test $(INSTALL_TOPFIND) -eq 0 || cp topfind "$(prefix)$(OCAML_CORE_STDLIB)"
++	test $(INSTALL_TOPFIND) -eq 0 || cp topfind "$(prefix)$(OCAML_SITELIB)"
+ 	files=`$(TOP)/tools/collect_files $(TOP)/Makefile.config findlib.cmi findlib.mli findlib.cma topfind.cmi topfind.mli fl_package_base.mli fl_package_base.cmi fl_metascanner.mli fl_metascanner.cmi fl_metatoken.cmi findlib_top.cma findlib.cmxa findlib.a findlib.cmxs findlib_dynload.cma findlib_dynload.cmxa findlib_dynload.a findlib_dynload.cmxs fl_dynload.mli fl_dynload.cmi META` && \
+ 	cp $$files "$(prefix)$(OCAML_SITELIB)/$(NAME)"
+ 	f="ocamlfind$(EXEC_SUFFIX)"; { test -f ocamlfind_opt$(EXEC_SUFFIX) && f="ocamlfind_opt$(EXEC_SUFFIX)"; }; \