From bdb387933a75b9682b097f179463ffc7af4bd37c Mon Sep 17 00:00:00 2001
From: Lars Bilke <lars.bilke@ufz.de>
Date: Wed, 16 Feb 2022 21:25:33 +0100
Subject: [PATCH] [web] Docs for OGS_USE_MKL.

---
 web/content/docs/devguide/advanced/configuration-options.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/web/content/docs/devguide/advanced/configuration-options.md b/web/content/docs/devguide/advanced/configuration-options.md
index fe080d8b421..4dc7a4e4246 100644
--- a/web/content/docs/devguide/advanced/configuration-options.md
+++ b/web/content/docs/devguide/advanced/configuration-options.md
@@ -46,3 +46,4 @@ CMake switches to enable / disable parts of OGS.
 - `OGS_CPU_ARCHITECTURE` - Optimizes for the given CPU architecture see [-march](https://gcc.gnu.org/onlinedocs/gcc-4.5.3/gcc/i386-and-x86_002d64-Options.html)-flag. Defaults to `native`. For redistributable binaries set to `generic` on Linux and `core2` on Mac OS. Can be disabled when set to `OFF`.
 - `CMAKE_LIBRARY_SEARCH_PATH` - Additional library installation path, e.g. `/opt/local` or `C:/libs`
 - `OGS_DEPENDENCY_VERSIONS` - Overwrite individual entries in `web/data/versions.json`. Should be quoted and `;`-separated, e.g.: `-DOGS_DEPENDENCY_VERSIONS="minimum_version.petsc=3.16.2;ctest.large_runtime=120"`.
+- `OGS_USE_MKL` - Enables MKL support. Requires MKL to be installed on the system. A CMake or environment variable `MKLROOT` or `MKL_DIR` has to point to the MKL installation directory. To enable 64-bit array indices in MKL add `-DMKL_USE_interface=ilp64` on the first CMake run (with a clean CMake cache) but this seems [not supported by Eigen](https://eigen.tuxfamily.org/dox/TopicUsingIntelMKL.html).
-- 
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