Funny about the JU_LEASTBYTESMASK macro—it still doesn't appear quite right

Yes, and it seems to have some involvement in the errors that kill the build.
In JudyInsArray.c we have:

static Word_t subexp_mask[] = {
    0,
    ~cJU_POP0MASK(1),
    ~cJU_POP0MASK(2),
    ~cJU_POP0MASK(3),
#ifdef JU_64BIT
    ~cJU_POP0MASK(4),
    ~cJU_POP0MASK(5),
    ~cJU_POP0MASK(6),
    ~cJU_POP0MASK(7),
#endif
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There's no problem with the first 5 elements listed there, but in relation to ~cJU_POP0MASK(5), ~cJU_POP0MASK(6) and ~cJU_POP0MASK(7) we get the error that they are not constant expressions ("initializer element is not constant"), thus breaking C's rules.

And in JudyCommon/JudyPrivateBranch.h we find:

#define cJU_POP0MASK(cPopBytes) JU_LEASTBYTESMASK(cPopBytes)
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Cheers,
Rob