From c98d66c8248ebef820820793fcfec6c9192f1d05 Mon Sep 17 00:00:00 2001
From: Maikel Nadolski <maikel.nadolski@gmail.com>
Date: Thu, 2 May 2019 17:58:33 +0200
Subject: [PATCH] Do not require CXX libraries for MPI which are deprecated.

---
 CMakeLists.txt                   | 1 +
 Tools/CMake/AMReXConfig.cmake.in | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a3cc9285f..cc9636ce29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.14)
 project(AMReX)
+enable_language(C) # needed for find_package(MPI REQUIRED "C")
 enable_language(CXX)
 enable_language(Fortran)
 
diff --git a/Tools/CMake/AMReXConfig.cmake.in b/Tools/CMake/AMReXConfig.cmake.in
index 65fdda628f..cf392a36d6 100644
--- a/Tools/CMake/AMReXConfig.cmake.in
+++ b/Tools/CMake/AMReXConfig.cmake.in
@@ -86,7 +86,7 @@ set(AMREX_ENABLE_HYPRE              @ENABLE_HYPRE@)
 # Find dependencies if needed
 #
 if (AMREX_ENABLE_MPI)
-   set( _mpi_components CXX )
+   set( _mpi_components "C" )
    if (AMREX_ENABLE_FORTRAN_INTERFACES)
          set( _mpi_components "${_mpi_components} Fortran" )
    endif ()