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This document describes in detail how to port a VICAR application or subroutine to the Unix operating system. VICAR (Video Information Communication And Retrieval) is the image processing system developed and used at JPL's Multimission Image Processing Laboratory (MIPL), that supports both flight project imaging and general image processing tasks.

The VICAR system dates back to the 1960's, when it ran on IBM mainframe computers. In the early 1980's, the system was converted from IBM to run on a DEC VAX/VMS system, and IBM support was dropped. The resulting VMS system is in use at the present time. Now, VICAR is being ported to run on a variety of Unix platforms. This port differs from the earlier conversion in that support for the VMS system is being maintained. The portable VICAR system will run under both VMS and Unix.