diff --git a/bin/ruby-build b/bin/ruby-build
index c6064f15..43f06758 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -13,6 +13,7 @@ install_package() {
   extract_package "$package_name"
   cd "$package_name"
   build_package "$package_name" $*
+  after_install_package "$package_name"
   cd "$cwd"
 }
 
@@ -65,11 +66,19 @@ build_package_ruby() {
   } >$LOG_PATH 2>&1
 }
 
+build_package_copy() {
+  cp -R . "$PREFIX_PATH"
+}
+
 build_package_ree_installer() {
   { ./installer --auto "$PREFIX_PATH"
   } >$LOG_PATH 2>&1
 }
 
+after_install_package() {
+  local stub=1
+}
+
 usage() {
   echo "usage: ruby-build DEFINITION-PATH INSTALLATION-PREFIX"
   exit 1
diff --git a/versions/jruby-1.6.3 b/versions/jruby-1.6.3
new file mode 100644
index 00000000..27e742c8
--- /dev/null
+++ b/versions/jruby-1.6.3
@@ -0,0 +1,17 @@
+after_install_package() {
+  shim_jruby
+  remove_windows_files
+}
+
+shim_jruby() {
+  cd "${PREFIX_PATH}/bin"
+  sed -i "" 's/^#!\/bin\/bash/#!\/usr\/bin\/env bash/' jruby
+  ln -fs jruby ruby
+}
+
+remove_windows_files() {
+  cd "$PREFIX_PATH"
+  rm -f bin/*.exe bin/*.dll bin/*.bat bin/jruby.sh
+}
+
+install_package "jruby-1.6.3" "http://jruby.org.s3.amazonaws.com/downloads/1.6.3/jruby-bin-1.6.3.tar.gz" copy