diff --git a/ruby-ast/PKGBUILD b/ruby-ast/PKGBUILD
new file mode 100644
index 0000000..1653eb7
--- /dev/null
+++ b/ruby-ast/PKGBUILD
@@ -0,0 +1,42 @@
+# Maintainer: George Rawlinson <grawlinson@archlinux.org>
+
+_gemname=ast
+pkgname=ruby-$_gemname
+pkgver=2.4.2
+pkgrel=1
+pkgdesc="A small library for working with immutable abstract syntax trees"
+arch=('any')
+url="https://github.com/whitequark/ast"
+license=('MIT')
+depends=('ruby')
+makedepends=('ruby-rdoc')
+options=('!emptydirs')
+source=("https://rubygems.org/downloads/$_gemname-$pkgver.gem")
+noextract=("$_gemname-$pkgver.gem")
+b2sums=('3317475dd7823f407f5c8cbf2f06486228566f2dd5d434b5f533001a7cfbf09169e510e86f807e9aa0cb240ee28d518aaa326990b3c1b21c83879461f1869d6a')
+
+package() {
+  local _gemdir="$(ruby -e'puts Gem.default_dir')"
+
+  gem install \
+    --verbose \
+    --ignore-dependencies \
+    --no-user-install \
+    --install-dir "$pkgdir/$_gemdir" \
+    --bindir "$pkgdir/usr/bin" \
+    "$_gemname-$pkgver.gem"
+
+  # delete cache
+  cd "$pkgdir/$_gemdir"
+  rm -vrf cache
+
+  cd "gems/$_gemname-$pkgver"
+
+  # move documentation
+  install -vd "$pkgdir/usr/share/doc/$pkgname"
+  mv -vt "$pkgdir/usr/share/doc/$pkgname" README.YARD.md
+
+  # move license
+  install -vd "$pkgdir/usr/share/licenses/$pkgname"
+  mv -vt "$pkgdir/usr/share/licenses/$pkgname" LICENSE.MIT
+}