Make install-guide MPI consistent

Fixes #3671

diff --git a/docs/install-guide/index.rst b/docs/install-guide/index.rst
index c40015459307c910ba2beb340287468ebecffd2b..9a5b136ce26f281cc397b5fc31003c093ec52393 100644 (file)
--- a/docs/install-guide/index.rst
+++ b/docs/install-guide/index.rst
@@ -237,7 +237,7 @@ library. LAM-MPI_ might work, but since it has
 been deprecated for years, it is not supported.
 
 For example, depending on your actual MPI library, use ``cmake
--DCMAKE_C_COMPILER=mpicc -DCMAKE_CXX_COMPILER=mpicxx -DGMX_MPI=on``.
+-DMPI_C_COMPILER=mpicc -DGMX_MPI=on``.
 
 
 CMake