Add jbuilder to makedepends/remove ocamlbuild. Fix package() step by adding opam init.

.SRCINFO

@@ -1,16 +1,16 @@
 # Generated by mksrcinfo v8
-# Thu Jan 25 22:33:46 UTC 2018
+# Fri Jan 26 13:06:06 UTC 2018
 pkgbase = ocaml-yojson
 	pkgdesc = An optimized parsing and printing library for JSON
 	pkgver = 1.4.0
-	pkgrel = 1
+	pkgrel = 2
 	url = https://github.com/mjambon/yojson
 	arch = i686
 	arch = x86_64
 	arch = armv7h
 	license = BSD
 	makedepends = ocaml-findlib
-	makedepends = ocamlbuild
+	makedepends = jbuilder
 	makedepends = cppo
 	depends = ocaml-biniou
 	depends = ocaml-easy-format

PKGBUILD

@@ -3,13 +3,13 @@
 pkgname=ocaml-yojson
 _oname=yojson
 pkgver=1.4.0
-pkgrel=1
+pkgrel=2
 pkgdesc='An optimized parsing and printing library for JSON'
 arch=('i686' 'x86_64' 'armv7h')
 options=('!makeflags' '!strip' 'staticlibs')
 license=('BSD')
 depends=('ocaml-biniou' 'ocaml-easy-format')
-makedepends=('ocaml-findlib' 'ocamlbuild' 'cppo')
+makedepends=('ocaml-findlib' 'jbuilder' 'cppo')
 url="https://github.com/mjambon/yojson"
 source=("https://github.com/mjambon/${_oname}/archive/v${pkgver}.tar.gz")
 sha256sums=('7d06340b769ed6ff5b2171a0e820d1e8f4337aef3929090fc976efe845639146')
@@ -20,6 +20,9 @@ build() {
 
 package() {
     cd ${srcdir}/${_oname}-${pkgver}
+    export OPAMROOT="${srcdir}/.opam"
+    opam init -n
+    mkdir -p "${pkgdir}/usr/bin"
     export OCAMLFIND_DESTDIR="${pkgdir}/$(ocamlfind printconf destdir)"
     install -dm755 "$OCAMLFIND_DESTDIR"
     jbuilder install