Compilation fails on MacOS 11.0

src/lib/block_if.c:141:1: error: static declaration of 'preadv' follows non-static declaration
preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset)
^
In file included from src/lib/block_if.c:50:
In file included from src/include/xhyve/block_if.h:38:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/uio.h:103:9: note: previous declaration is here
ssize_t preadv(int, const struct iovec *, int, off_t) __DARWIN_NOCANCEL(preadv) __API_AVAILABLE(macos(11.0), ios(14.0), watchos(7.0), tvos(14.0));
        ^
src/lib/block_if.c:152:1: error: static declaration of 'pwritev' follows non-static declaration
pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
^
In file included from src/lib/block_if.c:50:
In file included from src/include/xhyve/block_if.h:38:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/uio.h:104:9: note: previous declaration is here
ssize_t pwritev(int, const struct iovec *, int, off_t) __DARWIN_NOCANCEL(pwritev) __API_AVAILABLE(macos(11.0), ios(14.0), watchos(7.0), tvos(14.0));
        ^
2 errors generated.
make: *** [build/lib/block_if.o] Error 1

Start by reproducing the failure with the project build on macOS 11, then inspect src/lib/block_if.c around lines 141-152 and the sys/uio.h declarations shown in the error. Done means the project compiles successfully on macOS 11 without the preadv and pwritev declaration conflicts.