Hi Omlin, This is a known issue that was fixed but unfortunately not included in MPICH 3.4.2. A workaround would be to change /bin/sh to link to /bin/bash on your system. Or you could apply this patch to /home/omlins/soft/mpich-3.4.2/modules/yaksa/src/backend/cuda/cudalt.sh: https://github.com/pmodels/yaksa/pull/181/commits/eed193d9775dd0f33cbd8caa0d... Ken On 6/2/21, 12:54 PM, "Omlin Samuel via discuss" <[email protected]> wrote: Dear all, Building CUDA-aware MPICH fails for me after a few seconds on Ubuntu 20.04 following the MPICH installation guide (CUDA Driver Version: 465.19.01, CUDA Version: 11.3). Reproducer: mkdir ~/soft cd ~/soft tar -xzf mpich-3.4.2.tar.gz mkdir /tmp/mpich-3.4.2 cd /tmp/mpich-3.4.2 ~/soft/mpich-3.4.2/configure --with-cuda=/usr/local/cuda --with-device=ch4:ucx 2>&1 | tee configure.log make 2>&1 | tee make.log Error: /home/omlins/soft/mpich-3.4.2/modules/yaksa/src/backend/cuda/cudalt.sh: 35: Bad substitution make[2]: *** [Makefile:8697: src/backend/cuda/pup/yaksuri_cudai_pup_hvector__Bool.lo] Error 2 make[2]: Leaving directory '/tmp/mpich-3.4.2/modules/yaksa' make[1]: *** [Makefile:43560: all-recursive] Error 1 make[1]: Leaving directory '/tmp/mpich-3.4.2' make: *** [Makefile:11141: all] Error 2 The with tee created log files 'configure.log' and 'make.log', as well as 'config.log', are attached. Am I missing something or is there an issue with MPICH here? Thanks a lot in advance for helping me solving this issue! Cheers, Sam -- Samuel Omlin, PhD Computational Scientist CSCS - Swiss National Supercomputing Centre ETH Zurich Via Trevano 131 CH-6900 Lugano Switzerland