as this argument is not necessary. ${STAGE} was typo of ${STAGEDIR}
however, ${STAGEDIR} should not be put here. ${STAGEDIR}${PREFIX} is not
correct. Fortunately, because of this typo, it was working correctly.
> -DCMAKE_INSTALL_PREFIX=${STAGE}${PREFIX}
Furthermore, the following argument is set by Mk/bsd.cmake.mk.
> -DCMAKE_INSTALL_PREFIX:PATH="${PREFIX}"
Both arguments are entirely same and redundant so removing this is definitely
safe and no-op.
Sponsored by: HAW International, Inc.
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