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Glad you clarified and said Minix 3; I remember the 90s version had its own userland, and its own C compiler (also written AST), I know this because I hacked on them extensively. Probably the first time I have seen extensive source code, more than a snippet or a *.c file.

Indeed. I really love the part of the reverse check. It would never cross my mind.

Weren't they using FreeBSD?

No.

It seems they were using some of the tools:

https://2011.eurobsdcon.org/papers/gras/minix-bsd.pdf

"ABSTRACT MINIX 3 has imported a significant amount of userland BSD code. The trend began several years ago, but the pace has quickened markedly. We have already imported NetBSD’s buildsystem, NetBSD’s C library, the pkgsrc package management infrastructure, and various userland utilities from NetBSD and FreeBSD."

I thought we were talking about whether or not MINIX was using FreeBSD userland before moving to NetBSD for 3.2.0.

I was just generally asking. But thanks.