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I cant imagine that the % has anything to do with the UNIX world side of things, in ancient UNIX shells the % was used as a indicator for job numbers.
Providing as a opt the job number stored in a variable (i'm not even sure bsh/csh/sh from back then would evaluate that) as an argument sounds extremely unlikely.
Also seeing its escaped in the make output i'm pretty sure its passed verbatim to the BCPL side and probably only evaluated and expanded there by a preprocessor or the compiler. I do think the hunch that its some directives and/or variables for that.
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