diff --git a/ChangeLog b/ChangeLog
index 377625a4..0d4ac50e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-01-23 Ozan Çağlayan <ozan@pardus.org.tr>
+		* Add support for optional reverse="[tT]rue" in <Patch> for reverse applying
+		a patch.
+
 2010-01-22 Gökçen Eraslan <gokcen@pardus.org.tr>
 		* pisi/actionsapi/perlmodules.py: Do not ignore parameter in make
 		method (eg. perl Build test). Tests of some perl modules have never run
diff --git a/pisi-spec.dtd b/pisi-spec.dtd
index 9dd53354..8cf183b3 100644
--- a/pisi-spec.dtd
+++ b/pisi-spec.dtd
@@ -63,6 +63,7 @@
 <!ATTLIST Patch compressionType CDATA #IMPLIED>
 <!ATTLIST Patch level CDATA #IMPLIED>
 <!ATTLIST Patch target CDATA #IMPLIED>
+<!ATTLIST Patch reverse CDATA #IMPLIED>
 
 
 <!-- Package Section -->
diff --git a/pisi-spec.rng b/pisi-spec.rng
index 85c17d96..1c72dfe7 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -1372,6 +1372,9 @@
             <optional>
                 <attribute name="target"/>
             </optional>
+            <optional>
+                <attribute name="reverse"/>
+            </optional>
         </group>
     </define>
 
diff --git a/pisi/operations/build.py b/pisi/operations/build.py
index 4f51c6c6..27b8ec92 100644
--- a/pisi/operations/build.py
+++ b/pisi/operations/build.py
@@ -613,6 +613,7 @@ class Builder:
         for patch in self.spec.source.patches:
             patchFile = pisi.util.join_path(files_dir, patch.filename)
             relativePath = patch.filename
+            reverseApply = patch.reverse.lower() == "true"
             if patch.compressionType:
                 patchFile = pisi.util.uncompress(patchFile,
                                             compressType=patch.compressionType,
@@ -620,7 +621,7 @@ class Builder:
                 relativePath = relativePath.rsplit(".%s" % patch.compressionType, 1)[0]
 
             ctx.ui.action(_("* Applying patch: %s") % patch.filename)
-            pisi.util.do_patch(self.srcDir, patchFile, level=patch.level, name=relativePath)
+            pisi.util.do_patch(self.srcDir, patchFile, level=patch.level, name=relativePath, reverse=reverseApply)
         return True
 
     def generate_static_package_object(self):
diff --git a/pisi/specfile.py b/pisi/specfile.py
index d9bdf3ff..48755b9d 100644
--- a/pisi/specfile.py
+++ b/pisi/specfile.py
@@ -83,6 +83,7 @@ class Patch:
     s_Filename = [autoxml.String, autoxml.mandatory]
     a_compressionType = [autoxml.String, autoxml.optional]
     a_level = [autoxml.Integer, autoxml.optional]
+    a_reverse = [autoxml.String, autoxml.optional]
 
     #FIXME: what's the cleanest way to give a default value for reading level?
     #def decode_hook(self, node, errs, where):
diff --git a/pisi/util.py b/pisi/util.py
index af00d136..668353cd 100644
--- a/pisi/util.py
+++ b/pisi/util.py
@@ -463,7 +463,7 @@ def uncompress(patchFile, compressType="gz", targetDir=None):
     return filePath
 
 
-def do_patch(sourceDir, patchFile, level=0, name=None):
+def do_patch(sourceDir, patchFile, level=0, name=None, reverse=False):
     """Apply given patch to the sourceDir."""
     cwd = os.getcwd()
     if os.path.exists(sourceDir):
@@ -485,12 +485,12 @@ def do_patch(sourceDir, patchFile, level=0, name=None):
         if not os.path.exists(patchesDir):
             os.makedirs(patchesDir)
         # Import original patch into quilt tree
-        (ret, out, err) = run_batch('quilt import -p %d -P %s \"%s\"' % (level, name, patchFile))
+        (ret, out, err) = run_batch('quilt import %s -p %d -P %s \"%s\"' % (("-R" if reverse else ""), level, name, patchFile))
         # run quilt push to apply original patch into tree
         (ret, out, err) = run_batch('quilt push')
     else:
         # run GNU patch to apply original patch into tree
-        (ret, out, err) = run_batch("patch --remove-empty-files --no-backup-if-mismatch -p%d < \"%s\"" % (level, patchFile))
+        (ret, out, err) = run_batch("patch --remove-empty-files --no-backup-if-mismatch %s -p%d < \"%s\"" % (("-R" if reverse else ""), level, patchFile))
 
     if ret:
         if out is None and err is None: