fatal error: mpi.h: No such file or directory

[guotong1988]

_configtest.c:2:17: fatal error: mpi.h: No such file or directory
#include <mpi.h>
^
compilation terminated.
failure.
removing: _configtest.c _configtest.o
error: Cannot compile MPI programs. Check your configuration!!!

[nikoliazekter]

Run sudo apt install libopenmpi-dev and then try again.

[JasonHanG]

Same error and I'm using mac.
Try brew install openmpi
In case homebrew can't successfully download the files for you , use a vpn or manual brew Install it.

[kdldbq]

mac brew install mpich ,I do this setup successfully

[rasmh66]

On Ubuntu:
sudo apt install linuxbrew-wrapper
brew install openmpi
sudo apt-get install build-essential
PATH="/home/linuxbrew/.linuxbrew/bin:$PATH"
brew install openmpi

[Xiangju]

For those who needs to install software on remote/HPC server, to solve the error, you just need to load MPI library / package before installing the software.
For instance, installing mpi4py for python require MPI library, do the following before installing:

module avail MPI
module load name_of_MPI_library
pip install --user mpi4py # install mpi4py to user's own local directory

[mimoralea]

For RedHat and CentOS:

yum install openmpi-devel
export CC=/usr/lib64/openmpi/bin/mpicc
pip install mpi4py

Source: https://stackoverflow.com/a/51053324/786279

[straightjacket]

mac brew install mpich ,I do this setup successfully

Glad I found this thread this worked for me!

[milosjovanov]

On Amazon Linux 2023, try this:

sudo dnf install openmpi openmpi-develz
export PATH=$PATH:/usr/lib64/openmpi/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib64/openmpi/lib
pip3 install mpi4py