cmake is failing to detect the MPI build of hdf5
searching via
find_dependency(HDF5 COMPONENTS C)

with libhdf5-dev and libhdf5-mpi-dev install
(and libhdf5-openmpi-dev)

e.g. debci tests of dolfinx-performance tests fail with
-- HDF5_DIR: /usr/lib/x86_64-linux-gnu/cmake/hdf5_serial
-- HDF5_DEFINITIONS: 
-- HDF5_INCLUDE_DIRS: /usr/include/hdf5/serial
...
CMake Error at /usr/lib/x86_64-linux-gnu/cmake/dolfinx/DOLFINXConfig.cmake:105 (message):
  Found serial HDF5 build, MPI HDF5 build required

I note that /usr/lib/x86_64-linux-gnu/cmake/hdf5 now appears to refer
to the MPI build (it includes set(${HDF5_PACKAGE_NAME}_PROVIDES_PARALLEL        ON)
but apparently cmake is finding
/usr/lib/x86_64-linux-gnu/cmake/hdf5_serial/ instead

Previously the MPI build was found by default if installed.
Something in hdf5 2.2.0 has changed (broken) the status quo.

Hi,
cmake is a mess.

Please use '-DHDF5_ROOT=/usr/lib/x86_64-linux-gnu/hdf5/mpi' as a hint.

Best,
_g.

We believe that the bug you reported is fixed in the latest version of
fenics-dolfinx, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1145664@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Drew Parsons <dparsons@debian.org> (supplier of updated fenics-dolfinx package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 14 Sep 2026 22:52:32 +0200
Source: fenics-dolfinx
Architecture: source
Version: 1:0.11.0.post0-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Drew Parsons <dparsons@debian.org>
Closes: 1145664
Changes:
 fenics-dolfinx (1:0.11.0.post0-2) unstable; urgency=medium
 .
   * configure with -DHDF5_ROOT=/usr/lib/$(DEB_HOST_MULTIARCH)/hdf5/mpi
     since cmake does not reliably find the HDF5 MPI build on its own
     if the HDF5 serial build is also installed.
     - debian patch cmake_config_hdf5_mpi.patch sets HDF5_ROOT (MPI
       build) in the dolfinx cmake config file when finding HDF5
     - Closes: #1145664
Checksums-Sha1:
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 60823c17f9e2bef7c00d4f7b07abe37bd6f43268 48116 fenics-dolfinx_0.11.0.post0-2.debian.tar.xz
 3bac3f4cdf8217e97dca3aa7c9317cd2252860d7 28928 fenics-dolfinx_0.11.0.post0-2_amd64.buildinfo
Checksums-Sha256:
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 9ba13a59dc8612538b5a8cd9c39def138ed40246b5a258a321164d8eeeeccdc7 28928 fenics-dolfinx_0.11.0.post0-2_amd64.buildinfo
Files:
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 e5b09492e7c91848fe3ced3ed03a3ece 48116 math optional fenics-dolfinx_0.11.0.post0-2.debian.tar.xz
 88f401567eb31bc707fbcb91742bd397 28928 math optional fenics-dolfinx_0.11.0.post0-2_amd64.buildinfo
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