diff --git a/extra/js/PKGBUILD b/extra/js/PKGBUILD
new file mode 100644
index 000000000..6037d1e3c
--- /dev/null
+++ b/extra/js/PKGBUILD
@@ -0,0 +1,48 @@
+# $Id$
+# Maintainer: Ionut Biru <ibiru@archlinux.org>
+
+# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
+#  - patch for AArch64
+
+pkgname=js
+pkgver=24.2.0
+pkgrel=1
+pkgdesc="JavaScript interpreter and libraries"
+arch=(i686 x86_64)
+url="https://developer.mozilla.org/En/SpiderMonkey/17"
+license=(MPL)
+depends=(nspr gcc-libs readline zlib)
+makedepends=(python2 zip libffi)
+options=(!staticlibs)
+source=(http://ftp.mozilla.org/pub/mozilla.org/js/mozjs-$pkgver.tar.bz2
+        aarch64.patch)
+md5sums=('5db79c10e049a2dc117a6e6a3bc78a8e'
+         '144736bd4a4825ba5a1c87439230964d')
+
+prepare() {
+  rm -rf mozjs-$pkgver/js/src/editline
+  rm -rf mozjs-$pkgver/js/src/ctypes/libffi
+  cd mozjs-$pkgver
+  patch -p1 -F500 -i ../aarch64.patch
+}
+
+build() {
+  unset CPPFLAGS
+  cd mozjs-$pkgver/js/src
+  ./configure --prefix=/usr --with-system-nspr --enable-system-ffi \
+     --enable-readline --enable-threadsafe
+  make
+}
+
+check() {
+  cd mozjs-$pkgver/js/src
+  make check
+}
+
+package() {
+  cd mozjs-$pkgver/js/src
+  make DESTDIR="$pkgdir" install
+  find "$pkgdir"/usr/{lib/pkgconfig,include} -type f -exec chmod -x {} +
+}
+
+# vim:set ts=2 sw=2 et:
diff --git a/extra/js/aarch64.patch b/extra/js/aarch64.patch
new file mode 100644
index 000000000..b7dec4a2d
--- /dev/null
+++ b/extra/js/aarch64.patch
@@ -0,0 +1,13 @@
+diff -urN a/mfbt/double-conversion/utils.h b/mfbt/double-conversion/utils.h
+--- a/mfbt/double-conversion/utils.h	2013-10-29 14:40:19.000000000 -0600
++++ b/mfbt/double-conversion/utils.h	2015-07-10 22:55:40.262596161 -0600
+@@ -58,7 +58,8 @@
+     defined(__mips__) || defined(__powerpc__) || \
+     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
+     defined(__SH4__) || defined(__alpha__) || \
+-    defined(_MIPS_ARCH_MIPS32R2)
++    defined(_MIPS_ARCH_MIPS32R2) || \
++    defined(__AARCH64EL__)
+ #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
+ #elif defined(_M_IX86) || defined(__i386__) || defined(__i386)
+ #if defined(_WIN32)