diff --git a/mapserver.spec b/mapserver.spec
index 851f63f..9536037 100644
--- a/mapserver.spec
+++ b/mapserver.spec
@@ -63,7 +63,7 @@ BuildRequires:  krb5-devel
 BuildRequires:  libgcj-devel
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root
 Patch0:          mapserver-5.4.1_buildchecks.patch
-#Patch1:          hidden_layer.patch
+Patch1:          patch_3877-r11714.patch
 #Patch2:          bug3525_verbose_output.patch
 
 %define python_sitearch %(%{__python} -c "from distutils.sysconfig import get_python_lib; print get_python_lib(1)")
@@ -115,7 +115,7 @@ within the Java programming language.
 %prep
 %setup -q -n %{name}-%{fileversion}
 %patch0 -p1
-#%patch1 -p1
+%patch1 -p0
 #%patch2 -p1
 
 # fix spurious perm bits
@@ -289,6 +289,8 @@ rm -rf %{buildroot}
 %{_javadir}/*.jar
 
 %changelog
+* Fri May 27 2011 Stephan Holl <stephan.holl@intevation.de> 6.0.0
+- included the patch from #3877 to make it build
 * Mon May 16 2011 Stephan Holl <stephan.holl@intevation.de> 6.0.0
 - updated to new upstream version of mapserver 6.0.0 (see
   http://trac.osgeo.org/mapserver/browser/tags/rel-6-0-0/mapserver/HISTORY.TXT for a detailed description of the changes.
diff --git a/patch_3877-r11714.patch b/patch_3877-r11714.patch
new file mode 100644
index 0000000..c6b6320
--- /dev/null
+++ b/patch_3877-r11714.patch
@@ -0,0 +1,36 @@
+Index: mapserver-6.0.0/HISTORY.TXT
+===================================================================
+--- mapserver-6.0.0/HISTORY.TXT	(revision 11709)
++++ mapserver-6.0.0/HISTORY.TXT	(revision 11714)
+@@ -15,4 +15,6 @@
+ Version 6.0.1 (SVN branch-6-0):
+ ---------------------------
++
++- Fixed the build problem in mapunion.c (#3877)
+ 
+ - Union layer: Fixed the crash when styling source layers using attributes (#3870)
+Index: mapserver-6.0.0/mapunion.c
+===================================================================
+--- mapserver-6.0.0/mapunion.c	(revision 11709)
++++ mapserver-6.0.0/mapunion.c	(revision 11714)
+@@ -316,5 +316,5 @@
+             /* get items requested by the union layer plus the required items */
+             msLayerSetProcessingKey(srclayer, "ITEMS", itemlist);
+-            if (msLayerWhichItems(srclayer, TRUE, NULL) != MS_SUCCESS)
++            if (msLayerWhichItems(srclayer, MS_TRUE, NULL) != MS_SUCCESS)
+             {
+                 msFree(itemlist);
+@@ -325,5 +325,5 @@
+         {
+             /* get only the required items */
+-            if (msLayerWhichItems(srclayer, FALSE, NULL) != MS_SUCCESS)
++            if (msLayerWhichItems(srclayer, MS_FALSE, NULL) != MS_SUCCESS)
+                 return MS_FAILURE;
+         }
+@@ -354,5 +354,5 @@
+             
+             /* get only the required items */
+-            if (msLayerWhichItems(srclayer, FALSE, NULL) != MS_SUCCESS)
++            if (msLayerWhichItems(srclayer, MS_FALSE, NULL) != MS_SUCCESS)
+                 return MS_FAILURE;
+         }