Index: kde/kdelibs4/Portfile
===================================================================
--- kde/kdelibs4/Portfile	(revision 99110)
+++ kde/kdelibs4/Portfile	(working copy)
@@ -101,8 +101,14 @@
     reinplace "s|%APPLICATIONS_DIR%|${applications_dir}|g" \
         ${destroot}${prefix}/Library/LaunchAgents/org.macports.kdecache.plist
     
-    xinstall -d -m 755 ${destroot}${startup_root}/Library/LaunchAgents
-    ln -s ${prefix}/Library/LaunchAgents/org.macports.kdecache.plist ${destroot}${startup_root}/Library/LaunchAgents
+    # The startupitem.install keyword does not exist in MacPorts < 2.1.
+    if {![info exists startupitem.install]} {
+        set startupitem.install yes
+    }
+    if { ${startupitem.install} != "no" } {
+        xinstall -d -m 755 ${destroot}${startup_root}/Library/LaunchAgents
+        ln -s ${prefix}/Library/LaunchAgents/org.macports.kdecache.plist ${destroot}${startup_root}/Library/LaunchAgents
+    }
 }
 
 post-activate {