dim abandoned this revision. dim added a comment. Yes, this was indeed the wrong include order. During the latter stages of FreeBSD's buildworld, the compiler is invoked with `-nostdinc++`, but `/usr/include` was put before the libc++ include directory, `/usr/include/c++/v1`. So as @rsmith remarked, the system's `math.h` was found before the one from libc++, causing the complaints about missing declarations.
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