Detecting MPI

[drwells]

I don't know a ton about docker but this was on the mailing list:

[ 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$ 

see https://groups.google.com/g/dealii/c/0iNlXmvC7Ts

[luca-heltai]

This is related to not calling DEAL_II_SETUP_TARGET(target_name). If you forget to do that, then cmake does not configure correctly the includ paths.