diff --git a/Info.plist b/Info.plist
new file mode 100644
index 0000000..d964557
--- /dev/null
+++ b/Info.plist
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+        <key>CFBundleIdentifier</key>
+            <string>@BUNDLE@</string>	
+	<key>IFPkgFlagAllowBackRev</key>
+            <false/>
+	<key>IFPkgFlagAuthorizationAction</key>
+            <string>RootAuthorization</string>
+	<key>IFPkgFlagDefaultLocation</key>
+            <string>@INSTALLDIR@</string>
+	<key>IFPkgFlagFollowLinks</key>
+            <true/>
+	<key>IFPkgFlagInstallFat</key>
+            <false/>
+	<key>IFPkgFlagIsRequired</key>
+            <false/>
+	<key>IFPkgFlagOverwritePermissions</key>
+            <false/>
+	<key>IFPkgFlagRelocatable</key>
+            <false/>
+	<key>IFPkgFlagRestartAction</key>
+            <string>NoRestart</string>
+	<key>IFPkgFlagRootVolumeOnly</key>
+            <true/>
+	<key>IFPkgFlagUpdateInstalledLanguages</key>
+            <false/>	
+</dict>
+</plist>
diff --git a/README.txt b/README.txt
index 39614ac..2498bc2 100644
--- a/README.txt
+++ b/README.txt
@@ -2,11 +2,20 @@ Mac package installer for JRuby.
 
 Follow this steps to build the installer:
 
-1. Open JRuby-installer.pmdoc with PackageMaker that's bundled with The Apple Development Tools. 
 
-2. Put the JRuby distribution that you want to package under the directory "jruby_dist".
+From PackageMaker, the application:
+
+  1. Open JRuby-installer.pmdoc with PackageMaker that's bundled with The Apple Development Tools. 
+
+  2. Put the JRuby distribution that you want to package under the directory "jruby_dist".
+
+  3. Build the installer.
+
+
+From the command line:
+
+  run ./build.sh JRUBY_DIST_DIRECTORY JRUBY_VERSION
 
-3. Build the installer.
 
 
 TODO:
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..8ae2255
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,23 @@
+#/bin/sh -x
+#
+# Script to create the JRuby mac installer from the command line. It takes a while, be patient my friend.
+#
+# It needs two arguments from the command line:
+#
+#    $1: the jruby's distribution directory
+#    $2: the jruby's version
+#
+
+jruby_dist=$1
+jruby_version=$2
+
+unzip $jruby_dist/jruby-bin-$jruby_version.zip -d .;  # unpacking jruby.zip
+mv jruby-$jruby_version jruby_dist;
+
+find . -type f -name .DS_Store -print0 | xargs -0 rm;  # removing .DS_Store files
+
+sudo chown -R root:wheel jruby_dist;  #  we have to already set the privileges that the contents need after the installation
+
+/Developer/Applications/Utilities/PackageMaker.app/Contents/MacOS/PackageMaker -build -v -f . -doc JRuby-installer.pmdoc -p $jruby_dist/JRuby.pkg -i Info.plist;
+
+sudo rm -rf jruby_dist;