ruby31 @3.1.2_2 Error: "$procedure $targetname"

[cave-canem]

sudo port -vd install ruby31 +doc+gmp+jemalloc
...
...
linking transcoder utf8_mac.bundle
make[1]: Leaving directory '/opt/MacPorts/var/macports/build/_opt_macports-ports_lang_ruby31/ruby31/work/ruby-3.1.2'
make: Leaving directory '/opt/MacPorts/var/macports/build/_opt_macports-ports_lang_ruby31/ruby31/work/ruby-3.1.2'
Command failed:  cd "/opt/MacPorts/var/macports/build/_opt_macports-ports_lang_ruby31/ruby31/work/ruby-3.1.2" && /usr/bin/make -j4 -w all
Exit code: 2
Error: Failed to build ruby31: command execution failed
DEBUG: Error code: CHILDSTATUS 28809 2
DEBUG: Backtrace: command execution failed
    while executing
"system {*}$notty {*}$callback {*}$nice $fullcmdstring"
    invoked from within
"command_exec -callback portprogress::target_progress_callback build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
Error: See /opt/MacPorts/var/macports/logs/_opt_macports-ports_lang_ruby31/ruby31/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port ruby31 failed

See the detailed log in the attachment.

[cave-canem]

main.log