diff --git a/extra/js68/PKGBUILD b/extra/js68/PKGBUILD
new file mode 100644
index 000000000..860ce5e5d
--- /dev/null
+++ b/extra/js68/PKGBUILD
@@ -0,0 +1,92 @@
+# Maintainer: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
+
+# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
+#  - configure with --disable-lto
+#  - patch to fix build on ARM
+
+buildarch=12
+
+pkgname=js68
+pkgver=68.5.0
+pkgrel=2
+pkgdesc="JavaScript interpreter and libraries - Version 68"
+arch=(x86_64)
+url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey"
+license=(MPL)
+depends=(gcc-libs readline zlib sh)
+makedepends=(python2 zip autoconf2.13 python rust llvm clang)
+checkdepends=(mercurial git)
+_relver=${pkgver}esr
+source=(https://archive.mozilla.org/pub/firefox/releases/$_relver/source/firefox-$_relver.source.tar.xz{,.asc}
+        arm.patch)
+sha256sums=('52e784f98a37624e8b207f1b23289c2c88f66dd923798cae891a586a6d94a6d1'
+            'SKIP'
+            'bc00516032330760444939c516a60c78f868631e1b37f075f0fe71a53737b966')
+validpgpkeys=('14F26682D0916CDD81E37B6D61B7B526D98F0353') # Mozilla Software Releases <release@mozilla.com>
+
+# Make sure the duplication between bin and lib is found
+COMPRESSZST+=(--long)
+
+prepare() {
+  cd firefox-$pkgver
+  mkdir obj
+  patch -p1 -i ../arm.patch
+}
+
+build() {
+  local configure_args=(
+    --prefix=/usr
+    --disable-debug
+    --disable-debug-symbols
+    --disable-jemalloc
+    --disable-strip
+    --enable-hardening
+    --disable-lto
+    --enable-optimize
+    --enable-posix-nspr-emulation
+    --enable-readline
+    --enable-release
+    --enable-shared-js
+    --enable-tests
+    --enable-unaligned-private-values
+    --with-intl-api
+    --with-system-zlib
+    --without-system-icu
+  )
+
+  export AR=llvm-ar
+  export NM=llvm-nm
+  export RANLIB=llvm-ranlib
+
+  cd firefox-$pkgver/obj
+
+  sh ../js/src/configure "${configure_args[@]}"
+  make
+}
+
+check() {
+  local jstests_extra_args=(
+    --format=none
+    --exclude-random
+  ) jittest_extra_args=(
+    --format=none
+    --timeout 300
+  ) jittest_test_args=(
+    basic
+  )
+
+  cd firefox-$pkgver/obj
+  make -C js/src check-jstests check-jit-test \
+    JSTESTS_EXTRA_ARGS="${jstests_extra_args[*]}" \
+    JITTEST_EXTRA_ARGS="${jittest_extra_args[*]}" \
+    JITTEST_TEST_ARGS="${jittest_test_args[*]}"
+}
+
+package() {
+  cd firefox-$pkgver/obj
+  make DESTDIR="$pkgdir" install
+  rm "$pkgdir"/usr/lib/*.ajs
+  find "$pkgdir"/usr/{lib/pkgconfig,include} -type f -exec chmod -c a-x {} +
+}
+
+# vim:set ts=2 sw=2 et:
diff --git a/extra/js68/arm.patch b/extra/js68/arm.patch
new file mode 100644
index 000000000..9e2ed1510
--- /dev/null
+++ b/extra/js68/arm.patch
@@ -0,0 +1,15 @@
+https://bugzilla.mozilla.org/show_bug.cgi?id=1526653
+
+diff --git a/js/src/wasm/WasmSignalHandlers.cpp.orig b/js/src/wasm/WasmSignalHandlers.cpp
+index 636537f..0f3461a 100644
+--- a/js/src/wasm/WasmSignalHandlers.cpp.orig
++++ b/js/src/wasm/WasmSignalHandlers.cpp
+@@ -244,7 +244,7 @@ using mozilla::DebugOnly;
+ // emulation here.
+ 
+ #if defined(__linux__) && defined(__arm__)
+-#  define WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
++//#  define WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
+ #endif
+ 
+ #ifdef WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS