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diff --git CMakeLists.txt CMakeLists.txt
index 4846ff7..5e102ce 100644
--- libSplash-1.7.0/CMakeLists.txt
+++ libSplash-1.7.0/CMakeLists.txt
@@ -392,7 +392,8 @@ install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/tools/splash2xdmf.py DESTINATION bin)
#
enable_testing()
-if($ENV{USER} STREQUAL root)
+# OpenMPI root guard: https://github.com/open-mpi/ompi/issues/4451
+if("$ENV{USER}" STREQUAL "root")
set(MPI_ALLOW_ROOT --allow-run-as-root)
endif()
set(MPI_TEST_EXE ${MPIEXEC_EXECUTABLE} ${MPI_ALLOW_ROOT} ${MPIEXEC_NUMPROC_FLAG})
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