1 files changed, 32 insertions, 3 deletions
diff --git a/ruby.md b/ruby.md
index 0433f89..f53b375 100644
--- a/ruby.md
+++ b/ruby.md
@@ -13,19 +13,48 @@ First, in a *fresh* vagrant box:
 
 Then we get the dependencies and build all packages:
 
-    dependencies="`gem list | cut -d '(' -f 1`"
+    dependencies=" `gem list | cut -d '(' -f 1` "
+
+Gem cleanup:
+
+    sudo gem uninstall $dependencies
+
+Check existing dependencies:
+
+    for item in $dependencies; do
+      package=ruby-"`echo $item | sed -e 's/_/-/'`"
+
+      if apt-cache search $package &> /dev/null; then
+        packages="$packages $package"
+        dependencies=$(echo $dependencies | sed -e "s/ $package //")
+        sudo apt-get install $package
+      fi
+    done
+
+Build remaining packages:
 
     for gem in $dependencies; do
       gem2deb $gem
     done
 
-Cleanup:
+Report:
 
-    sudo gem uninstall $dependencies
+    echo "Existing debian dependencies: $packages"
+    echo "New packages                : $dependencies"
+
+Test:
+
+    sudo dpkg -i *deb
+
+Deb cleanup:
+
+    sudo dpkg -r $dependencies
 
 Additional steps:
 
+* Backport existing dependencies if needed.
 * Fix `debian/control` and other FIXME's on each package.
 * Put `debian/` folder in a `debian` branch on each source.
 * [Review the code](https://manual.sarava.org/specs/code/).
+* Automate building with pbuilder.
 * Upstream pull requests.