Make sure that MacPorts never gets to the DYLD_LIBRARY_PATH

--HG--
branch : bgschaid/minorAdditionsBranch

etc/settings.sh

@@ -48,9 +48,13 @@ _foamAddLib()
     do
         export LD_LIBRARY_PATH=$1:$LD_LIBRARY_PATH
         if [ "$WM_ARCH_BASE" = "darwin" ]
+        then
+            # do NOT add the lib of MacPort as this might break programs
+            if [ "$1" != "/opt/local/lib" ]
             then
 		export DYLD_LIBRARY_PATH=$1:$DYLD_LIBRARY_PATH
 	    fi
+        fi
         shift
     done
 }