Properly build libjs-of-ocaml-doc (Closes: #987458)

debian/control

@@ -6,6 +6,7 @@ Uploaders: Stéphane Glondu <glondu@debian.org>
 Build-Depends:
  debhelper-compat (= 13),
  ocaml,
+ ocaml-odoc,
  ocaml-dune (>= 2.5),
  ocaml-findlib,
  ocamlbuild,

debian/rules

@@ -39,6 +39,7 @@ endif
 	$(DUNE_INSTALL) js_of_ocaml-toplevel
 	dune build -p js_of_ocaml-tyxml
 	$(DUNE_INSTALL) js_of_ocaml-tyxml
+	$(MAKE) doc
 
 override_dh_auto_test:
 # Needs ppx-expect
@@ -50,3 +51,11 @@ override_dh_auto_install:
 	  rm -rf debian/tmp/usr/doc/$$u; \
 	done
 	rm -f debian/tmp/usr/doc/js_of_ocaml/LICENSE
+
+override_dh_install:
+	dh_install
+	mkdir -p debian/libjs-of-ocaml-doc/usr/share/doc/libjs-of-ocaml-doc
+	rm -rf debian/libjs-of-ocaml-doc/usr/share/doc/libjs-of-ocaml-doc/api
+	rm -rf debian/libjs-of-ocaml-doc/usr/share/doc/libjs-of-ocaml-doc/manual
+	cp -a _build/default/_doc/_html debian/libjs-of-ocaml-doc/usr/share/doc/libjs-of-ocaml-doc/api
+	cp -a _build/default/manual debian/libjs-of-ocaml-doc/usr/share/doc/libjs-of-ocaml-doc/manual