diff --git a/community/opam/APKBUILD b/community/opam/APKBUILD
index b16097d7c0d..7c7f52982e5 100644
--- a/community/opam/APKBUILD
+++ b/community/opam/APKBUILD
@@ -1,14 +1,15 @@
 # Contributor: Michael Zuo <muh.muhten@gmail.com>
 # Maintainer: Anil Madhavapeddy <anil@recoil.org>
+# FIXME: lib-ext downloads dependencies; package them and use system-provided!
 pkgname=opam
 pkgver=1.2.2
-pkgrel=3
+pkgrel=4
 pkgdesc="OCaml Package Manager"
 url="https://opam.ocaml.org"
 arch="all !x86 !armhf !s390x"  # ocaml not avail on excluded platforms
 license="LGPL-3.0"
 depends="ocaml ocaml-camlp4 curl tar unzip rsync aspcud patch"
-makedepends="ocaml-camlp4-dev"
+makedepends="ocaml-compiler-libs ocaml-camlp4-dev"
 source="https://github.com/ocaml/$pkgname/releases/download/$pkgver/$pkgname-full-$pkgver.tar.gz
 	fix-default-stubsdir.patch"
 builddir="$srcdir/$pkgname-full-$pkgver"
@@ -24,7 +25,10 @@ build() {
 		--mandir=/usr/share/man \
 		--infodir=/usr/share/info \
 		--localstatedir=/var
-	make -j1 lib-ext all
+
+	# -unsafe-string needed to make it build with ocaml >=4.06.
+	OCAMLFLAGS="-unsafe-string" \
+		make -j1 lib-ext all
 }
 
 package() {