Altium with xilinx webpack for XEM3005

I’m building a project for the XEM3005 using Altium. I tried importing the dcm_sys.v but when I import the TNM_NET and TIMESPEC lines from the ucf file into the Altium constraints file, it doesn’t recognize them.

Would I be better off using the Altiums “CLOCK_MANAGER” from their “FPGA Configurable Generic.IntLib” library and just converting the period in the TIMESPEC line to a frequency?