Trying to install on High Sierra:
$ sudo /opt/local/bin/port install realpath
---> Fetching archive for realpath
---> Attempting to fetch realpath-1.0.1_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/realpath
---> Attempting to fetch realpath-1.0.1_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/realpath
---> Installing realpath @1.0.1_1
---> Activating realpath @1.0.1_1
---> Cleaning realpath
---> Scanning binaries for linking errors
---> No broken files found.
---> Found 10 broken ports, determining rebuild order
You can always run 'port rev-upgrade' again to fix errors.
The following ports will be rebuilt:
blosc @1.5.2
llvm-3.4 @3.4.2
cctools @862+llvm34
db48 @4.8.30
py27-numexpr @2.4
gettext @0.19.4
pcre @8.36
swig @3.0.5
hdf5 @1.8.14+cxx
zmq @3.2.5
Continue? [Y/n]: y
---> Fetching archive for lz4
---> Attempting to fetch lz4-1.9.3_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/lz4
---> Attempting to fetch lz4-1.9.3_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/lz4
---> Installing lz4 @1.9.3_1
---> Activating lz4 @1.9.3_1
---> Cleaning lz4
---> Fetching archive for zlib
---> Attempting to fetch zlib-1.2.11_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/zlib
---> Attempting to fetch zlib-1.2.11_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/zlib
---> Installing zlib @1.2.11_0
---> Cleaning zlib
---> Deactivating zlib @1.2.8_0
---> Cleaning zlib
---> Activating zlib @1.2.11_0
---> Cleaning zlib
---> Fetching archive for libiconv
---> Attempting to fetch libiconv-1.16_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/libiconv
---> Attempting to fetch libiconv-1.16_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/libiconv
---> Installing libiconv @1.16_1
---> Cleaning libiconv
---> Deactivating libiconv @1.14_0
---> Cleaning libiconv
---> Activating libiconv @1.16_1
---> Cleaning libiconv
---> Fetching archive for ncurses
---> Attempting to fetch ncurses-6.2_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/ncurses
---> Attempting to fetch ncurses-6.2_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/ncurses
---> Installing ncurses @6.2_1
---> Cleaning ncurses
---> Deactivating ncurses @5.9_2
---> Cleaning ncurses
---> Activating ncurses @6.2_1
---> Cleaning ncurses
---> Computing dependencies for gettext
---> Fetching archive for gettext
---> Attempting to fetch gettext-0.19.8.1_2.darwin_17.x86_64.tbz2 from https://packages.macports.org/gettext
---> Attempting to fetch gettext-0.19.8.1_2.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/gettext
---> Installing gettext @0.19.8.1_2
---> Cleaning gettext
---> Computing dependencies for gettext
---> Deactivating gettext @0.19.4_0
---> Cleaning gettext
---> Activating gettext @0.19.8.1_2
---> Cleaning gettext
---> Computing dependencies for xz
---> Fetching archive for xz
---> Attempting to fetch xz-5.2.5_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/xz
---> Attempting to fetch xz-5.2.5_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/xz
---> Installing xz @5.2.5_0
---> Cleaning xz
---> Computing dependencies for xz
---> Deactivating xz @5.2.1_0
---> Cleaning xz
---> Activating xz @5.2.5_0
---> Cleaning xz
---> Computing dependencies for zstd
---> Fetching archive for zstd
---> Attempting to fetch zstd-1.5.0_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/zstd
---> Attempting to fetch zstd-1.5.0_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/zstd
---> Installing zstd @1.5.0_0
---> Activating zstd @1.5.0_0
---> Cleaning zstd
---> Fetching archive for lzo2
---> Attempting to fetch lzo2-2.10_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/lzo2
---> Attempting to fetch lzo2-2.10_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/lzo2
---> Installing lzo2 @2.10_0
---> Cleaning lzo2
---> Deactivating lzo2 @2.08_0
---> Cleaning lzo2
---> Activating lzo2 @2.10_0
---> Cleaning lzo2
---> Computing dependencies for snappy
---> Fetching archive for snappy
---> Attempting to fetch snappy-1.1.9_2.darwin_17.x86_64.tbz2 from https://packages.macports.org/snappy
---> Attempting to fetch snappy-1.1.9_2.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/snappy
---> Installing snappy @1.1.9_2
---> Activating snappy @1.1.9_2
---> Cleaning snappy
---> Computing dependencies for blosc
---> Fetching archive for blosc
---> Attempting to fetch blosc-1.21.0_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/blosc
---> Attempting to fetch blosc-1.21.0_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/blosc
---> Installing blosc @1.21.0_0
---> Cleaning blosc
---> Computing dependencies for blosc
---> Deactivating blosc @1.5.2_0
---> Cleaning blosc
---> Activating blosc @1.21.0_0
---> Cleaning blosc
---> Fetching archive for libffi
---> Attempting to fetch libffi-3.3_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/libffi
---> Attempting to fetch libffi-3.3_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/libffi
---> Installing libffi @3.3_1
---> Cleaning libffi
---> Deactivating libffi @3.2.1_0
---> Cleaning libffi
---> Activating libffi @3.3_1
---> Cleaning libffi
---> Fetching archive for db48
---> Attempting to fetch db48-4.8.30_4.darwin_17.x86_64.tbz2 from https://packages.macports.org/db48
---> Attempting to fetch db48-4.8.30_4.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/db48
---> Unable to uninstall db48 @4.8.30_4, the following ports depend on it:
---> python27 @2.7.9_0
Warning: Uninstall forced. Proceeding despite dependencies.
---> Deactivating db48 @4.8.30_4
---> Cleaning db48
---> Uninstalling db48 @4.8.30_4
---> Cleaning db48
---> Installing db48 @4.8.30_4
---> Activating db48 @4.8.30_4
---> Cleaning db48
---> Computing dependencies for readline
---> Fetching archive for readline
---> Attempting to fetch readline-8.1.000_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/readline
---> Attempting to fetch readline-8.1.000_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/readline
---> Installing readline @8.1.000_0
---> Activating readline @8.1.000_0
---> Cleaning readline
---> Computing dependencies for gdbm
---> Fetching archive for gdbm
---> Attempting to fetch gdbm-1.19_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/gdbm
---> Attempting to fetch gdbm-1.19_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/gdbm
---> Installing gdbm @1.19_0
---> Cleaning gdbm
---> Computing dependencies for gdbm
---> Deactivating gdbm @1.11_1
---> Cleaning gdbm
---> Activating gdbm @1.19_0
---> Cleaning gdbm
---> Computing dependencies for perl5.28
---> Fetching archive for perl5.28
---> Attempting to fetch perl5.28-5.28.3_2.darwin_17.x86_64.tbz2 from https://packages.macports.org/perl5.28
---> Attempting to fetch perl5.28-5.28.3_2.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/perl5.28
---> Installing perl5.28 @5.28.3_2
---> Activating perl5.28 @5.28.3_2
---> Cleaning perl5.28
---> Computing dependencies for perl5
---> Fetching archive for perl5
---> Attempting to fetch perl5-5.28.3_0+perl5_28.darwin_17.noarch.tbz2 from https://packages.macports.org/perl5
---> Attempting to fetch perl5-5.28.3_0+perl5_28.darwin_17.noarch.tbz2.rmd160 from https://packages.macports.org/perl5
---> Installing perl5 @5.28.3_0+perl5_28
---> Cleaning perl5
---> Computing dependencies for perl5
---> Deactivating perl5 @5.12.4_0+perl5_16
---> Cleaning perl5
---> Activating perl5 @5.28.3_0+perl5_28
---> Cleaning perl5
---> Fetching archive for llvm_select
---> Attempting to fetch llvm_select-2_0.darwin_17.noarch.tbz2 from https://packages.macports.org/llvm_select
---> Attempting to fetch llvm_select-2_0.darwin_17.noarch.tbz2.rmd160 from https://packages.macports.org/llvm_select
---> Installing llvm_select @2_0
---> Cleaning llvm_select
---> Deactivating llvm_select @1.0_0
---> Cleaning llvm_select
---> Activating llvm_select @2_0
---> Cleaning llvm_select
---> Computing dependencies for llvm-3.4
---> Fetching archive for llvm-3.4
---> Attempting to fetch llvm-3.4-3.4.2_14.darwin_17.x86_64.tbz2 from https://packages.macports.org/llvm-3.4
---> Attempting to fetch llvm-3.4-3.4.2_14.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/llvm-3.4
---> Installing llvm-3.4 @3.4.2_14
---> Cleaning llvm-3.4
---> Computing dependencies for llvm-3.4
---> Deactivating llvm-3.4 @3.4.2_6
---> Cleaning llvm-3.4
---> Activating llvm-3.4 @3.4.2_14
---> Cleaning llvm-3.4
---> Computing dependencies for libedit
---> Fetching archive for libedit
---> Attempting to fetch libedit-20210216-3.1_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/libedit
---> Attempting to fetch libedit-20210216-3.1_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/libedit
---> Installing libedit 20210216-3.1_0
---> Cleaning libedit
---> Computing dependencies for libedit
---> Deactivating libedit 20140620-3.1_0
---> Cleaning libedit
---> Activating libedit 20210216-3.1_0
---> Cleaning libedit
---> Fetching archive for bzip2
---> Attempting to fetch bzip2-1.0.8_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/bzip2
---> Attempting to fetch bzip2-1.0.8_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/bzip2
---> Installing bzip2 @1.0.8_0
---> Cleaning bzip2
---> Deactivating bzip2 @1.0.6_0
---> Cleaning bzip2
---> Activating bzip2 @1.0.8_0
---> Cleaning bzip2
---> Computing dependencies for openssl
---> Fetching archive for openssl
---> Attempting to fetch openssl-1.1.1k_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/openssl
---> Attempting to fetch openssl-1.1.1k_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/openssl
---> Installing openssl @1.1.1k_0
---> Cleaning openssl
---> Computing dependencies for openssl
---> Deactivating openssl @1.0.2_0
---> Cleaning openssl
---> Activating openssl @1.1.1k_0
---> Cleaning openssl
---> Fetching archive for icu
---> Attempting to fetch icu-67.1_4.darwin_17.x86_64.tbz2 from https://packages.macports.org/icu
---> Attempting to fetch icu-67.1_4.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/icu
---> Installing icu @67.1_4
---> Activating icu @67.1_4
---> Cleaning icu
---> Computing dependencies for libxml2
---> Fetching archive for libxml2
---> Attempting to fetch libxml2-2.9.12_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/libxml2
---> Attempting to fetch libxml2-2.9.12_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/libxml2
---> Installing libxml2 @2.9.12_1
---> Cleaning libxml2
---> Computing dependencies for libxml2
---> Deactivating libxml2 @2.9.2_2
---> Cleaning libxml2
---> Activating libxml2 @2.9.12_1
---> Cleaning libxml2
---> Computing dependencies for xar
---> Fetching archive for xar
---> Attempting to fetch xar-1.8.0.452_0.darwin_17.x86_64.tbz2 from https://packages.macports.org/xar
---> Attempting to fetch xar-1.8.0.452_0.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/xar
---> Installing xar @1.8.0.452_0
---> Activating xar @1.8.0.452_0
---> Cleaning xar
---> Fetching archive for libcxx
---> Attempting to fetch libcxx-5.0.1_4.darwin_17.noarch.tbz2 from https://packages.macports.org/libcxx
---> Attempting to fetch libcxx-5.0.1_4.darwin_17.noarch.tbz2.rmd160 from https://packages.macports.org/libcxx
---> Installing libcxx @5.0.1_4
---> Activating libcxx @5.0.1_4
---> Cleaning libcxx
---> Computing dependencies for llvm-10
---> Fetching archive for llvm-10
---> Attempting to fetch llvm-10-10.0.1_1.darwin_17.x86_64.tbz2 from https://packages.macports.org/llvm-10
---> Attempting to fetch llvm-10-10.0.1_1.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/llvm-10
---> Installing llvm-10 @10.0.1_1
---> Activating llvm-10 @10.0.1_1
---> Cleaning llvm-10
---> Computing dependencies for cctools
---> Fetching archive for cctools
---> Attempting to fetch cctools-949.0.1_1+llvm10.darwin_17.x86_64.tbz2 from https://packages.macports.org/cctools
---> Attempting to fetch cctools-949.0.1_1+llvm10.darwin_17.x86_64.tbz2.rmd160 from https://packages.macports.org/cctools
---> Installing cctools @949.0.1_1+llvm10
---> Cleaning cctools
---> Computing dependencies for cctools
---> Deactivating cctools @862_1+llvm34
---> Cleaning cctools
---> Activating cctools @949.0.1_1+llvm10
---> Cleaning cctools
Error: rev-upgrade failed: invalid command name "::registry::entry4"
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.