# MPI is not found by find\_library(ParaView) in v5.9 but it works in v5.8
**URL:** https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242
**Category:** Development
**Created:** [May 18, 2021, 7:56am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242 "2021-05-18T07:56:44Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@lhofmann](https://discourse.paraview.org/u/lhofmann)
#### Post date: [May 18, 2021, 7:56am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/1 "2021-05-18T07:56:44Z")
I’m building ParaView from source on a current Arch Linux. During build, MPI is found just fine, but calling `find_library(ParaView)` results in error
```auto
-- Could NOT find MPI_CXX (missing: MPI_CXX_WORKS)
CMake Error at /usr/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find MPI (missing: MPI_C_FOUND MPI_CXX_FOUND)
Call Stack (most recent call first):
/usr/share/cmake-3.20/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9/vtk/vtkm/cmake/FindMPI.cmake:1705 (find_package_handle_standard_args)
/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9/vtk/vtkm/cmake/VTKmWrappers.cmake:18 (find_package)
/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9/vtk/vtkm/VTKmConfig.cmake:149 (include)
/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9/vtk/vtk-config.cmake:124 (find_package)
/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9/paraview-config.cmake:53 (find_package)
CMakeLists.txt:108 (find_package)
```
ParaView v5.8.0 works just fine, when built with exact same configuration. Even if I copy `FindMPI.cmake` from v5.8.0 to v5.9.1 it still fails.
I have found two workarounds:
- call `find_library(MPI)` before `find_library(ParaView)`
- delete `lib/cmake/paraview-5.9/vtk/vtkm/cmake/FindMPI.cmake`
I’m not really sure if this is a problem with my system or a bug.
My cmake config is as follows:
```auto
cmake "../ParaView-${paraview_version}-src" \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX=../ParaView-${paraview_version} \
-DPARAVIEW_ENABLE_FFMPEG=ON \
-DPARAVIEW_ENABLE_GDAL=ON \
-DPARAVIEW_ENABLE_MOTIONFX=ON \
-DPARAVIEW_ENABLE_PDAL=ON \
-DPARAVIEW_ENABLE_VISITBRIDGE=ON \
-DPARAVIEW_ENABLE_XDMF3=ON \
-DPARAVIEW_INSTALL_DEVELOPMENT_FILES=ON \
-DPARAVIEW_USE_MPI=ON \
-DPARAVIEW_USE_PYTHON=ON \
-DPARAVIEW_USE_RAYTRACING=OFF \
-DPARAVIEW_BUILD_WITH_EXTERNAL=ON \
-DVTK_MODULE_USE_EXTERNAL_VTK_gl2ps=OFF \
-DVTK_MODULE_USE_EXTERNAL_VTK_libharu=OFF \
-DVTK_SMP_IMPLEMENTATION_TYPE=TBB \
-DVTKm_ENABLE_MPI=ON \
-DVTK_MODULE_ENABLE_VTK_IOGDAL=YES \
-DVTK_MODULE_ENABLE_VTK_IOPDAL=YES \
-DCMAKE_C_FLAGS="-DH5_USE_110_API" \
-DCMAKE_CXX_FLAGS="-DH5_USE_110_API" \
-DVTK_MODULE_USE_EXTERNAL_VTK_pegtl=OFF \
-GNinja
cmake --build . --target install
```
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 18, 2021, 8:21am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/2 "2021-05-18T08:21:09Z")
> [@lhofmann](#):
>
> lib/cmake/paraview-5.9/vtk/vtkm/cmake/FindMPI.cmake
where is this file from ?
---
### Author:  [@lhofmann](https://discourse.paraview.org/u/lhofmann)
#### Post date: [May 18, 2021, 9:20am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/3 "2021-05-18T09:20:53Z")
I’m guessing that this file is installed by VTK-m that ships with ParaView.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 18, 2021, 9:21am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/4 "2021-05-18T09:21:53Z")
so you have an installed paraview in your system (installed using pacman?) and during compilatio of ParaView, this file is being picked up by cmake, but it shouldn’t, is that correct ?
---
### Author:  [@lhofmann](https://discourse.paraview.org/u/lhofmann)
#### Post date: [May 18, 2021, 9:40am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/5 "2021-05-18T09:40:23Z")
No, I install paraview into an empty directory in my home dir. I don’t have the paraview package installed.
During `find_package(ParaView)` (where I specified that directory via `ParaView_DIR`), it correctly picks up the files in `ParaView_DIR`. This causes CMake to use FindMPI.cmake that comes with VTK-m, which for some reason fails on my system (but only in paraview v5.9, it works fine with v5.8).
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 18, 2021, 9:42am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/6 "2021-05-18T09:42:09Z")
Can you share an example ? Examples plugins are building fine here.
---
### Author:  [@lhofmann](https://discourse.paraview.org/u/lhofmann)
#### Post date: [May 18, 2021, 9:51am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/7 "2021-05-18T09:51:23Z")
A CMakeLists.txt like this already fails:
```auto
cmake_minimum_required(VERSION 3.12)
find_package(ParaView REQUIRED)%
```
`cmake . -DParaView_DIR=/home/lhofmann/Libraries/paraview/ParaView-v5.9.1/lib/cmake/paraview-5.9`
But I guess this is not a bug but something weird with my system then. I will stick with removing FindMPI.cmake from my paraview install for now 😉
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 18, 2021, 9:56am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/8 "2021-05-18T09:56:10Z")
Which cmake are you using ?
---
### Author:  [@lhofmann](https://discourse.paraview.org/u/lhofmann)
#### Post date: [May 18, 2021, 9:57am UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/9 "2021-05-18T09:57:13Z")
cmake 3.20.2
(updated my system yesterday)
---
### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [May 18, 2021, 1:37pm UTC](https://discourse.paraview.org/t/mpi-is-not-found-by-find-library-paraview-in-v5-9-but-it-works-in-v5-8/7242/10 "2021-05-18T13:37:24Z")
I suspect that the `FindMPI` is broken in some way. This, unfortunately, is the state of `FindMPI` in a number of its corner cases ☹ . I recommend nuking the VTK-m copy so that the CMake-shipped copy is used instead.