Apple's man page for execve() does not list ENOTSUP as a possible error code. This problem had me stumped for hours. After I was convinced I wasn't doing anything wrong, and there was no bug with the Factor FFI, I did some Googling and finally stumbled across this.
Turns out execve() returns this error if your program is multi-threaded. Makes perfect sense, but I wish Apple had kept the man page up to date!
In any case, I'm posting it here so that any other poor sucker who runs into this can find the solution with Google in less time than I did.
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