Index: src/lib/com/izforge/izpack/panels/SudoPanel.java
===================================================================
--- src/lib/com/izforge/izpack/panels/SudoPanel.java	(revision 1139)
+++ src/lib/com/izforge/izpack/panels/SudoPanel.java	(working copy)
@@ -155,7 +155,7 @@
             vars.put("password", pass);
 
             List oses = new ArrayList();
-            oses.add(new OsConstraint("unix", null, null, null));
+            oses.add(new OsConstraint("unix", null, null, null, null));
 
             ArrayList plist = new ArrayList();
             ParsableFile pf = new ParsableFile(file.getAbsolutePath(), null, null, oses);
Index: src/lib/com/izforge/izpack/util/OsConstraint.java
===================================================================
--- src/lib/com/izforge/izpack/util/OsConstraint.java	(revision 1139)
+++ src/lib/com/izforge/izpack/util/OsConstraint.java	(working copy)
@@ -55,6 +55,9 @@
 
     /** OS architecture from java system properties */
     private String arch;
+    
+    /** OS release */
+    private String release;
 
     /**
      * Constructs a new instance. Please remember, MacOSX belongs to Unix family.
@@ -63,13 +66,15 @@
      * @param name The exact OS name.
      * @param version The exact OS version (check property <code>os.version</code> for values).
      * @param arch The machine architecture (check property <code>os.arch</code> for values).
+     * @param release The release information found from OsVersion.getOsDetails()
      */
-    public OsConstraint(String family, String name, String version, String arch)
+    public OsConstraint(String family, String name, String version, String arch, String release)
     {
         this.family = family != null ? family.toLowerCase() : null;
         this.name = name != null ? name.toLowerCase() : null;
         this.version = version != null ? version.toLowerCase() : null;
         this.arch = arch != null ? arch.toLowerCase() : null;
+        this.release = release != null ? release.toLowerCase() : null;
     }
 
     /**
@@ -81,15 +86,22 @@
     {
         boolean match = true;
         String osName = System.getProperty("os.name").toLowerCase();
-
+        
         if (arch != null && arch.length() != 0)
         {
             match = System.getProperty("os.arch").toLowerCase().equals(arch);
         }
         if (match && version != null && version.length() != 0)
         {
-            match = System.getProperty("os.version").toLowerCase().equals(version);
+        	match = System.getProperty("os.version").toLowerCase().equals(version);
         }
+        if (match && release != null && release.length() != 0)
+        {        
+        	if(OsVersion.getOsDetails() != null)
+        	{
+        		match = OsVersion.getOsDetails().toLowerCase().contains(release);	
+        	}
+        }
         if (match && name != null && name.length() != 0)
         {
             match = osName.equals(name);
@@ -110,7 +122,7 @@
             }
         }
 
-        return match && (family != null || name != null || version != null || arch != null);
+        return match && (family != null || name != null || version != null || arch != null || release != null);
     }
 
     /**
@@ -128,7 +140,7 @@
         {
             XMLElement os = (XMLElement) osIterator.next();
             osList.add(new OsConstraint(os.getAttribute("family", null), os.getAttribute("name",
-                    null), os.getAttribute("version", null), os.getAttribute("arch", null)));
+                    null), os.getAttribute("version", null), os.getAttribute("arch", null), os.getAttribute("release", null)));
         }
 
         // backward compatibility: still support os attribute
@@ -136,7 +148,7 @@
         if (osattr != null && osattr.length() > 0)
         {
             // add the "os" attribute as a family constraint
-            osList.add(new OsConstraint(osattr, null, null, null));
+            osList.add(new OsConstraint(osattr, null, null, null, null));
         }
 
         return osList;