--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lang/mozjs52/mozjs52.sh	Sun Apr 07 14:37:20 2019 +0200
@@ -0,0 +1,57 @@
+#!/bin/sh
+#
+# Copyright (c) 2019 David Demelier <markand@malikania.fr>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+
+PKGNAME=mozjs52
+PKGVERSION=52.9.0
+PKGREVISION=1
+PKGLICENSE="MPLv20"
+PKGSUMMARY="Mozilla Javascript engine also know as SpiderMonkey"
+PKGDOWNLOAD="http://releases.mozilla.org/pub/firefox/releases/${PKGVERSION}esr/source/firefox-${PKGVERSION}esr.source.tar.xz"
+PKGDEPENDS="shells/bash:build python/python2:build lib/libffi lib/icu lib/zlib"
+
+: ${CC:=clang}
+: ${CXX:=clang++}
+
+build()
+{
+	rm -rf firefox-${PKGVERSION}esr
+	tar xvaf firefox-${PKGVERSION}esr.source.tar.xz
+	pushd firefox-${PKGVERSION}esr
+
+	# credits to FreeBSD.
+	patch -p0 < ../patch-clang.patch
+	pushd js/src
+	CC="$CC" HOST_CC="$CC" \
+	CXX="$CXX" HOST_CXX="$CXX" \
+	SHELL="/usr/bin/bash" PYTHON="/usr/bin/python2" \
+	./configure \
+		--prefix=/usr \
+		--disable-tests \
+		--disable-jemalloc \
+		--enable-shared-js \
+		--enable-ctypes \
+		--with-system-icu \
+		--with-system-nspr \
+		--with-system-zlib
+	SHELL="/usr/bin/bash" PYTHON="/usr/bin/python2" \
+	make
+	make install DESTDIR=$DESTDIR
+	popd
+
+	popd
+	rm -rf firefox-${PKGVERSION}esr
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lang/mozjs52/patch-clang.patch	Sun Apr 07 14:37:20 2019 +0200
@@ -0,0 +1,23 @@
+Proposed workaround/fix for:
+https://bugzilla.mozilla.org/show_bug.cgi?id=1426865
+
+diff --git a/js/public/TypeDecls.h b/js/public/TypeDecls.h
+index acb93f9..cbd4b04 100644
+--- js/public/TypeDecls.h
++++ js/public/TypeDecls.h
+@@ -22,6 +22,8 @@
+ 
+ #include "js-config.h"
+ 
++#pragma GCC visibility push(default)
++
+ struct JSContext;
+ class JSFunction;
+ class JSObject;
+@@ -76,4 +78,6 @@ typedef PersistentRooted<Value>       PersistentRootedValue;
+ 
+ } // namespace JS
+ 
++#pragma GCC visibility pop
++
+ #endif /* js_TypeDecls_h */