Compiling: missing lower_half_api.h

[cessenat]

From scratch:

1. Building mpich

spack install mpich pmi=pmix 
export PATH=/home/cessenat/Softs/spack_tmp7/spack/opt/spack/linux-ubuntu20.04-zen2/gcc-9.4.0/mpich-4.2.3-eaak5amaokghucoksym2ns2z6ho2hqyj/bin:$PATH

2. Building mana following procedure
   https://github.com/mpickpt/mana/blob/main/mpi-proxy-split/README.md#1-setting-up-mana-from-its-github-repository

cd /tmp
git clone https://github.com/mpickpt/mana.git
cd mana
export MANA_ROOT=$PWD
git submodule update --init
./configure
make
...

> cd mpi-proxy-split && make install && make -j tests
> make[2] : on entre dans le répertoire « /tmp/mana/mpi-proxy-split »
> make -C mpi-wrappers libmpiwrappers.a
> make[3] : on entre dans le répertoire « /tmp/mana/mpi-proxy-split/mpi-wrappers »
> ./p2p-deterministic.py p2p-deterministic.txt > p2p-deterministic.h
> mpic++ -std=c++14 -g -O2 -fPIC -I/tmp/mana/dmtcp/include -I/tmp/mana/dmtcp/jalib -I.. -I/tmp/mana/dmtcp/src -I../lower-half -c -o mpi_p2p_wrappers.o mpi_p2p_wrappers.cpp
> In file included from mpi_p2p_wrappers.cpp:27:
> ../mpi_plugin.h:29:10: fatal error: lower_half_api.h: Aucun fichier ou dossier de ce type
>    29 | #include "lower_half_api.h"
>       |          ^~~~~~~~~~~~~~~~~~
> compilation terminated.
> make[3]: *** [Makefile:74 : mpi_p2p_wrappers.o] Erreur 1
> make[3] : on quitte le répertoire « /tmp/mana/mpi-proxy-split/mpi-wrappers »

3. Same issue with spack
   spack install --fresh mana@main ^mpich pmi=pmix
   using the following mana/package.py below
   package.txt