Copy *.tsk to appl$dir:

Copy *.odl to lb:[1,5]

Create a directory on sy: called [ZZDECUSC]
Copy all files from DECUSC2 to [ZZDECUSC]

To run CC:

	run $cc/command="cc yourfile"
	run $as/command="as yourfile -d"
	link yourfile,lb:[1,5]c.odl/lib

Libraries include:

	C.OLB		Normal library (FCS)
	CR.OLB		RMS library for the PRO
	CTEX.OLB	PRO interface library
	CX.OLB		RSX interface library
	PML.OLB		Portable math library

Good luck.