py38-mpi4py @3.1.4: error: Cannot compile MPI programs. Check your configuration!!!

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-10.6_i386-builder/builds/133290/steps/install-port/logs/stdio

--->  Building py38-mpi4py
DEBUG: Executing proc-pre-org.macports.build-build-0
DEBUG: Executing org.macports.build (py38-mpi4py)
DEBUG: Environment: 
CC='/opt/local/bin/mpicc-mpich-clang11'
CC_PRINT_OPTIONS='YES'
CC_PRINT_OPTIONS_FILE='/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_python_py-mpi4py/py38-mpi4py/work/.CC_PRINT_OPTIONS'
CFLAGS='-arch i386 -isysroot/'
CPATH='/opt/local/include'
CXX='/opt/local/bin/mpicxx-mpich-clang11'
CXXFLAGS='-arch i386 -stdlib=libc++ -isysroot/'
DEVELOPER_DIR='/Developer'
F77='/opt/local/bin/mpif77-mpich-clang11'
F90='/opt/local/bin/mpif90-mpich-clang11'
F90FLAGS='-m32'
FC='/opt/local/bin/mpif90-mpich-clang11'
FCFLAGS='-m32'
FFLAGS='-m32'
LDFLAGS='-arch i386'
LIBRARY_PATH='/opt/local/lib'
MACOSX_DEPLOYMENT_TARGET='10.6'
OBJC='/opt/local/bin/clang-mp-11'
OBJCFLAGS='-arch i386 -isysroot/'

MPI configuration: [mpi] from 'mpi.cfg'
MPI C compiler:    /usr/bin/mpicc
MPI C++ compiler:  /usr/bin/mpicxx
MPI F compiler:    /usr/bin/mpif90
MPI F90 compiler:  /usr/bin/mpif90
MPI F77 compiler:  /usr/bin/mpif77
checking for library 'lmpe' ...
/usr/bin/mpicc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -pipe -Os -arch i386 -isysroot/ -c _configtest.c -o _configtest.o
cc1: error: unrecognized command line option "-Wno-unused-result"
failure.

error: Cannot compile MPI programs. Check your configuration!!!

ERROR Backend subprocess exited when trying to invoke build_wheel

It looks like it is not using the right compiler.