STK: mpi.h: No such file or directory

Created by: nschloe

With the simple configuration

cmake \
  -DTrilinos_ENABLE_ALL_PACKAGES:BOOL=ON \
  -DTrilinos_ASSERT_MISSING_PACKAGES:BOOL=OFF \
  -DTrilinos_ENABLE_TESTS:BOON=ON \
  ../../source-upstream/

Trilinos fails to compile:

[...]
[ 88%] Building CXX object packages/stk/stk_util/stk_util/parallel/CMakeFiles/stk_util_parallel.dir/ParallelIndexGapFinder.cpp.o
In file included from /home/nschloe/software/trilinos/source-upstream/packages/stk/stk_util/stk_util/parallel/ParallelIndexGapFinder.cpp:34:0:
/home/nschloe/software/trilinos/source-upstream/packages/stk/stk_util/stk_util/parallel/ParallelIndexGapFinder.hpp:41:19: fatal error: mpi.h: No such file or directory
 #include "mpi.h"

This should be intercepted at configure stage.