R @4.3.0: configure: error: cannot compile a simple Fortran program

[ryandesign (Ryan Carsten Schmidt)]

R 4.3.0 fails to configure (on Snow Leopard only) with this error:

​https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/151728/steps/install-port/logs/stdio
​https://build.macports.org/builders/ports-10.6_i386-builder/builds/116239/steps/install-port/logs/stdio

checking how to get verbose linking output from /opt/local/bin/gfortran-mp-12... configure: WARNING: compilation failed

checking for Fortran libraries of /opt/local/bin/gfortran-mp-12... 
checking how to get verbose linking output from /opt/local/bin/clang-mp-15... configure: WARNING: cannot determine how to obtain linking information from /opt/local/bin/clang-mp-15

checking for C libraries of /opt/local/bin/clang-mp-15... 
checking for dummy main to link with Fortran libraries... none
checking for Fortran name-mangling scheme... configure: error: in `/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_math_R/R/work/R-4.3.0':
configure: error: cannot compile a simple Fortran program
See `config.log' for more details