Camlp4 error

[Andreas Enge <andreas@enge.fr>]

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Hello,

the attached (partial) package is supposed to add GTK+ bindings for OCaml, which
I would like to have for unison. Building currently fails with the following
message:
camlp4o pa_macro.cmo -D HAS_PRINTEXC_BACKTRACE -impl gtkSignal.ml4 -o gtkSignal.ml
Camlp4: Uncaught exception: DynLoader.Error ("Camlp4MacroParser.cmo", "file not found in path")
Makefile:515: recipe for target 'gtkSignal.ml' failed

The file Camlp4MacroParser.cmo is available in
/gnu/store/ikshd53q3pp3mdcsjqp5kkfakmcjs4xp-camlp4-4.02.0+1/lib/camlp4/Camlp4Parsers/

Does someone familiar with OCaml know what to do? Do we need a search path
specification?

Maybe relevant: configure complains about
checking for ocamlfind... no
./configure: line 2670: no: command not found
configure: WARNING: Ignoring ocamlfind

Thanks for your help!

Andreas


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diff --git a/gnu/packages/ocaml.scm b/gnu/packages/ocaml.scm
index 12d813f..3e68917 100644
--- a/gnu/packages/ocaml.scm
+++ b/gnu/packages/ocaml.scm
@@ -26,6 +26,7 @@
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages)
   #:use-module (gnu packages gcc)
+  #:use-module (gnu packages gtk)
   #:use-module (gnu packages base)
   #:use-module (gnu packages emacs)
   #:use-module (gnu packages texinfo)
@@ -472,3 +473,37 @@ 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 lablgtk
+  (package
+    (name "lablgtk")
+    (version "2.18.3")
+    (source
+      (origin
+        (method url-fetch)
+          (uri (string-append "https://forge.ocamlcore.org/frs/download.php/"
+                              "1479/lablgtk-2.18.3.tar.gz"))
+          (sha256
+            (base32
+              "1bybn3jafxf4cx25zvn8h2xj9agn1xjbn7j3ywxxqx6az7rfnnwp"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("camlp4" ,camlp4)
+       ("ocaml" ,ocaml)
+       ("pkg-config" ,pkg-config)))
+    (inputs
+     `(("gtk+" ,gtk+-2)))
+    (arguments
+     `(#:parallel-build? #f)) ; just in case
+    (home-page "http://lablgtk.forge.ocamlcore.org/")
+    (synopsis "GTK+ bindings for OCaml")
+    (description
+     "LablGtk is an OCaml interface to GTK+ 1.2 and 2.x.  It provides
+a strongly-typed object-oriented interface that is compatible with the
+dynamic typing of GTK+.  Most widgets and methods are available.  LablGtk
+also provides bindings to
+gdk-pixbuf, the GLArea widget (in combination with LablGL), gnomecanvas,
+gnomeui, gtksourceview, gtkspell,
+libglade (and it an generate OCaml code from .glade files),
+libpanel, librsvg and quartz.")
+    (license lgpl2.1)))