portlint complains:

> Running Q/A tests (stage-qa)

Warning: 'lib/librustc_macros-f4b01deaf441a3c2.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/libstd-bfb99e8572f1252a.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/libtest-21c7f70387d7fa17.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/rustlib/x86_64-unknown-freebsd/lib/libstd-bfb99e8572f1252a.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/rustlib/x86_64-unknown-freebsd/lib/libtest-21c7f70387d7fa17.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/librustc_driver-963a59e0388463b3.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}