still generates a binary with the -mmacosx-version-min=10.13 flag.

Hi,

Did you check with CCFLAGS?

If that fails try adding to  CC= or  LD= definition

Did you check on these files (they're what should get installed)?

 otool -l binary blib/script/parl.exe
otool -l binary  blib/script/parldyn.exe
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