Problem with -ASM

I am trying to test one IR to RF code found on rentron, I am trying to adjust it for 16F877A. Can someone please help me correct this code: (Rest of my code will be in PBP)

Code:

ASM Hold ; generate 40kHz carrier when GPIO.0 = 1 bcf PortD,2 ; LED = off btfss PortD,0 ; Is data input at logic 1..? goto $-1 ; No, then keep waiting Freq1 bsf PortD,2 ; Yes, so begin 40kHz IR carrier generation btfss PortD,0 ; 2uS goto Hold ; 3uS btfss PortD,0 ; 4uS goto Hold ; 5uS btfss PortD,0 ; 6uS goto Hold ; 7uS btfss PortD,0 ; 8uS goto Hold ; 9uS btfss PortD,0 ; 10uS goto Hold ; 11uS btfss PortD,0 ; 12uS goto Hold ; 13uS (~52% duty-cycle) bcf PortD,2 ; 14uS turn off IR LED here btfss PortD,0 ; 15uS goto Hold ; 16uS btfss PortD,0 ; 17uS goto Hold ; 18uS btfss PortD,0 ; 19uS goto Hold ; 20uS btfss PortD,0 ; 21uS goto Hold ; 22uS btfsc PortD,0 ; 23uS If PortD,0 = 0 end carrier, else continue goto Freq1 ; 25uS, GOTO requires 2uS, 25uS total=40kHz goto Hold ; return & wait ENDASM END

Where there was GPIO I changed it to PortD, I know it seems wrong, but please excuse my ignorance towards Assembly.
My IR LED is attached to PortD.2 & My RF data in is at PortD.0
When I compile this the error which comes is: "\D_DRIVE\IR_TO_RF\IR_2_RF.ASM 231 : Symbol not previously defined (PortD)" x 15 times