gr-gfdm @20200409-df94a58d_4: ModuleNotFoundError: No module named 'doxyindex'

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-11_arm64-builder/builds/101382/steps/install-port/logs/stdio

Traceback (most recent call last):
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_gr-gfdm/gr-gfdm/work/gr-gfdm-df94a58da883e796c18a0a5679d4992e94158c8c/docs/doxygen/swig_doc.py", line 33, in <module>
    from doxyxml import DoxyIndex, DoxyClass, DoxyFriend, DoxyFunction, DoxyFile, base
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_gr-gfdm/gr-gfdm/work/gr-gfdm-df94a58da883e796c18a0a5679d4992e94158c8c/docs/doxygen/doxyxml/__init__.py", line 67, in <module>
    from doxyindex import DoxyIndex, DoxyFunction, DoxyParam, DoxyClass, DoxyFile, DoxyNamespace, DoxyGroup, DoxyFriend, DoxyOther
ModuleNotFoundError: No module named 'doxyindex'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_gr-gfdm/gr-gfdm/work/gr-gfdm-df94a58da883e796c18a0a5679d4992e94158c8c/docs/doxygen/swig_doc.py", line 35, in <module>
    from gnuradio.doxyxml import DoxyIndex, DoxyClass, DoxyFriend, DoxyFunction, DoxyFile, base
ModuleNotFoundError: No module named 'gnuradio.doxyxml'
make[2]: *** [swig/gfdm_swig_doc.i] Error 1
make[2]: Leaving directory `/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_gr-gfdm/gr-gfdm/work/build'
make[1]: *** [swig/CMakeFiles/gfdm_swig_swig_doc.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....