From a23a6c59283bedc3e5215857a8d14c92343903e5 Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Thu, 16 Mar 2023 09:26:23 -0500
Subject: [PATCH] Improve error message when parallel HDF5 is found but MPI not
 enabled

---
 CMakeLists.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 11ae71ac65d..0dcaa6fb374 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -156,9 +156,9 @@ endif()
 find_package(HDF5 REQUIRED COMPONENTS C HL)
 if(HDF5_IS_PARALLEL)
   if(NOT OPENMC_USE_MPI)
-    message(FATAL_ERROR "Parallel HDF5 was detected, but the detected compiler,\
-     ${CMAKE_CXX_COMPILER}, does not support MPI. An MPI-capable compiler must \
-     be used with parallel HDF5.")
+    message(FATAL_ERROR "Parallel HDF5 was detected, but MPI was not enabled.\
+      To use parallel HDF5, OpenMC needs to be built with MPI support by passing\
+      -DOPENMC_USE_MPI=ON when calling cmake.")
   endif()
   message(STATUS "Using parallel HDF5")
 endif()