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Got on my iMac Pro checking the speed during Mojave download:

In file included from encode/base_n.cc:21:
In file included from /usr/local/include/boost/math/common_factor.hpp:13:
/usr/local/include/boost/math/common_factor_ct.hpp:16:1: warning: This header is deprecated. Use <boost/integer/common_factor_ct.hpp> instead. [-W#pragma-messages]
BOOST_HEADER_DEPRECATED("<boost/integer/common_factor_ct.hpp>");
^
/usr/local/include/boost/config/header_deprecated.hpp:23:37: note: expanded from macro 'BOOST_HEADER_DEPRECATED'
# define BOOST_HEADER_DEPRECATED(a) BOOST_PRAGMA_MESSAGE("This header is deprecated. Use " a " instead.")
                                    ^
/usr/local/include/boost/config/pragma_message.hpp:24:34: note: expanded from macro 'BOOST_PRAGMA_MESSAGE'
# define BOOST_PRAGMA_MESSAGE(x) _Pragma(BOOST_STRINGIZE(message(x)))
                                 ^
<scratch space>:3:2: note: expanded from here
 message("This header is deprecated. Use " "<boost/integer/common_factor_ct.hpp>" " instead.")
 ^

BTW I configured with --with-werror but this did not stop building. So very low priority.