I'm trying to build 4.1.1 on our local cluster. I'm configuring with ./configure --prefix=/people/d3g293/mpich/mpich-4.1.1/install --with-device=ch4:ofi --with-libfabric=embedded --enable-threads=multiple --with-slurm CC=gcc CXX=g++ (I also tried --with-device=ch4:ofi:sockets) and my environment is Currently Loaded Modulefiles: 1) gcc/8.1.0 3) cmake/3.22.1 5) mkl/2019u5 2) python/3.7.2 4) git/2.11.0(default) 6) texlive/2017 I keep getting errors that look like In file included from ./prov/opx/include/rdma/opx/fi_opx_reliability.h:36, from ./prov/opx/include/rdma/opx/fi_opx_domain.h:44, from prov/opx/src/fi_opx_cntr.c:35: ./prov/opx/include/rdma/opx/fi_opx_hfi1_transport.h: At top level: ./prov/opx/include/rdma/opx/fi_opx.h:209:44: error: expected identifier or '(' before 'if' #define OPX_COMPILE_TIME_ASSERT(cond, msg) if(0){switch(0){case 0:case cond:;}} Any suggestions on how to cure this? I've had pretty good luck building earlier versions of MPICH (4.0.2) using this formula. Bruce Palmer Computer Scientist Pacific Northwest National Laboratory (509) 375-3899