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From what I can see on the back of this image, "Matt Whelan's Compiler Kit for dBASE IV" is part of the CA-Clipper 5.3 for DOS Upgrade package. This does not seem to be included on the version here on Winworld.
Does anyone have the CA-Clipper 5.3 for DOS Upgrade CD-ROM Version?
Interesting. I have Clipper 5.3 Upgrade, but the floppy version, and it most definitely doesn't have the dBase IV compiler kit. Dunno about the CD version (and I'm not sure that such a thing even exists, TBH). Also, what I read from this picture is:
CA-Clipper is supported by productive solutions...
CA-Clipper / Compiler Kit for dBase IV
In other words, the compiler kit (and CA-Tools) are separately sold products, not included in Clipper 5.3 . I could be wrong, of course, but the contents of my Clipper 5.3 package supports my view.
P.S. Oops, my mistake, CD version of this upgrade apparently exists. Still, I don't think it contains this kit (and CA-Tools too).