groff @1.22.4_3 Build error, fails with 'command execution failed'

[docgawnz]

Fresh Macports 2.6.3 installation on OSX 10.15.3, groff fails to install with 'command execution failed'. Log excerpt attached.

Originally happened while attempting to install gnuradio.

Already tried:

• installing texinfo (texinfo install attempts to also build groff; fails
• cleaning groff and attempting install again (same result)
• consulted previous groff-related tickets

bash-3.2# port clean groff
--->  Cleaning groff
bash-3.2# port install groff
--->  Computing dependencies for groff
--->  Fetching archive for groff
--->  Attempting to fetch groff-1.22.4_3.darwin_19.x86_64.tbz2 from https://packages.macports.org/groff
--->  Attempting to fetch groff-1.22.4_3.darwin_19.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/groff/groff
--->  Attempting to fetch groff-1.22.4_3.darwin_19.x86_64.tbz2 from https://kmq.jp.packages.macports.org/groff
--->  Fetching distfiles for groff
--->  Verifying checksums for groff
--->  Extracting groff
--->  Applying patches to groff
--->  Configuring groff
--->  Building groff
Error: Failed to build groff: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_sysutils_groff/groff/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port groff failed

[docgawnz]

Relevant portion of log