Hi Dilip, MPICH 3.0.4 was released in 2013. The current MPICH release is 4.2.0 (https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eWS... ). Is there any reason you need to install mpich 3.0.4? Otherwise, we suggest you try mpich-4.2.0. The issue is due to modern Fortran compilers being more strict in type checking. There is a compilation flag (FFLAGS=-fallow-argument-mismatch) that you may try to bypass the issue. But try the latest MPICH release first. Regards, Hui ________________________________ From: Dilip V via discuss <[email protected]> Sent: Friday, March 15, 2024 11:02 AM To: [email protected] <[email protected]> Cc: Dilip V <[email protected]> Subject: [mpich-discuss] Fwd: Trouble with installation of MPICH-3.0.4 Hello, I'm trying to install MPICH(mpich-3. 0. 4. tar. gz) on my Dell Dekstop running on Ubuntu 20. 04 LTS. I'm encountering error message during ./configure that reads --------------------------------------------------------------------------------------------"checking ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hello, I'm trying to install MPICH(mpich-3.0.4.tar.gz) on my Dell Dekstop running on Ubuntu 20.04 LTS. I'm encountering error message during ./configure that reads -------------------------------------------------------------------------------------------- "checking whether gfortran allows mismatched arguments... no configure: error: The Fortran compiler gfortran will not compile files that call the same routine with arguments of different types." ---------------------------------------------------------------------------------------------- I'm using gfortran for my FORTRAN 90 as well as FORTRAN 77 compiler. How do I resolve this? My c.txt is attached below for reference.