Hi Jack,

Not sure which image you are using. In dealii/dealii:*master-focal*, the 
openmpi include directory is within */usr/lib*

$ ls -lh /usr/lib/x86_64-linux-gnu/openmpi/include/
total 352K
-rw-r--r-- 1 root root  597 Apr 15  2020 mpi-ext.h
-rw-r--r-- 1 root root 171K Apr 15  2020 mpi.h
-rw-r--r-- 1 root root  16K Apr 15  2020 mpi_portable_platform.h
-rw-r--r-- 1 root root 1.8K Apr 15  2020 mpif-c-constants-decl.h
-rw-r--r-- 1 root root 2.7K Apr 15  2020 mpif-config.h
-rw-r--r-- 1 root root  14K Apr 15  2020 mpif-constants.h
-rw-r--r-- 1 root root  683 Apr 15  2020 mpif-ext.h
-rw-r--r-- 1 root root 2.0K Apr 15  2020 mpif-externals.h
-rw-r--r-- 1 root root 7.9K Apr 15  2020 mpif-handles.h
-rw-r--r-- 1 root root 2.1K Apr 15  2020 mpif-io-constants.h
-rw-r--r-- 1 root root 1.2K Apr 15  2020 mpif-io-handles.h
-rw-r--r-- 1 root root 3.0K Apr 15  2020 mpif-sentinels.h
-rw-r--r-- 1 root root 104K Apr 15  2020 mpif-sizeof.h
-rw-r--r-- 1 root root 2.8K Apr 15  2020 mpif.h
drwxr-xr-x 6 root root  193 Sep  8  2020 openmpi

This should be autodetected if using cmake

$ ompi_info
                 Package: Debian OpenMPI
                Open MPI: 4.0.3
  Open MPI repo revision: v4.0.3
   Open MPI release date: Mar 03, 2020
                Open RTE: 4.0.3
  Open RTE repo revision: v4.0.3
   Open RTE release date: Mar 03, 2020
                    OPAL: 4.0.3
      OPAL repo revision: v4.0.3
       OPAL release date: Mar 03, 2020
                 MPI API: 3.1.0
            Ident string: 4.0.3
                  Prefix: /usr
 Configured architecture: x86_64-pc-linux-gnu
          Configure host: lcy01-amd64-020
           Configured by: buildd
           Configured on: Wed Apr 15 13:14:35 UTC 2020
          Configure host: lcy01-amd64-020
  Configure command line: '--build=x86_64-linux-gnu' '--prefix=/usr'
                          '--includedir=${prefix}/include'
                          '--mandir=${prefix}/share/man'
                          '--infodir=${prefix}/share/info'
                          '--sysconfdir=/etc' '--localstatedir=/var'
                          '--disable-silent-rules'
                          '--libdir=${prefix}/lib/x86_64-linux-gnu'
                          '--runstatedir=/run' '--disable-maintainer-mode'
                          '--disable-dependency-tracking'
                          '--disable-silent-rules'
                          '--disable-wrapper-runpath'
                          '--with-package-string=Debian OpenMPI'
                          '--with-verbs' '--with-libfabric' '--with-psm2'
                          '--with-jdk-dir=/usr/lib/jvm/default-java'
                          '--enable-mpi-java'
                          '--enable-opal-btl-usnic-unit-tests'
                          '--with-libevent=external'
                          '--with-pmix=/usr/lib/x86_64-linux-gnu/pmix'
                          '--disable-silent-rules' '--enable-mpi-cxx'
                          '--with-hwloc=/usr' '--with-libltdl'
                          '--with-devel-headers' '--with-slurm' '--with-sge'
                          '--without-tm' '--sysconfdir=/etc/openmpi'
                          '
*--libdir=${prefix}/lib/x86_64-linux-gnu/openmpi/lib*'
                          '
*--includedir=${prefix}/lib/x86_64-linux-gnu/openmpi/include*'

Better to provide more info about your container env to help diagnostic the 
problem.

Best,
Chengjiang Yin

在2021年12月14日星期二 UTC+8 16:54:42<jack urombo> 写道:

> The current docker image is not finding mpi.h
>
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>
>
>
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>
> *[ 50%] Building CXX object CMakeFiles/cdr.dir/cdr.cc.o In file included 
> from /usr/include/deal.II/base/conditional_ostream.h:19, 
>                 from /home/dealii/dealii/cdr/cdr.cc:1: 
> /usr/include/deal.II/base/config.h:490:12: fatal error: mpi.h: No such file 
> or directory  490 | #  include <mpi.h>      |            ^~~~~~~ 
> compilation terminated. make[2]: *** [CMakeFiles/cdr.dir/build.make:63: 
> CMakeFiles/cdr.dir/cdr.cc.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:76: 
> CMakeFiles/cdr.dir/all] Error 2 make: *** [Makefile:84: all] Error 2 
> dealii@cdab72233c4c:~/dealii/cdr$ *
>

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