From 79ea539b93c35467e7e55a913d28dbf2e1fdad68 Mon Sep 17 00:00:00 2001 From: Wolfgang Bangerth Date: Tue, 10 Oct 2023 10:50:44 -0600 Subject: [PATCH] Clarify UMFPACK instructions in the readme file. --- doc/readme.html | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/doc/readme.html b/doc/readme.html index 50bbddeb39..2e5c76eb90 100644 --- a/doc/readme.html +++ b/doc/readme.html @@ -709,9 +709,14 @@

UMFPACK, which is part of SuiteSparse, is a sparse direct solver that we often use in prototype codes where the goal is to simply get a linear system solved robustly. - The interface will be enabled by default, either using a version installed on your system of using a version that comes bundled with + The interface will be enabled by default, either using a version installed on your system, or using the version that comes bundled with deal.II. It can be disabled explicitly by using the - -DDEAL_II_WITH_UMFPACK=OFF argument. To use a self compiled version, pass the argument + -DDEAL_II_WITH_UMFPACK=OFF + argument. It will also be disabled if no version + installed on the system can be found, and if the + version that comes bundled with deal.II cannot be + compiled, for example because no version of LAPACK + can be found. To use a self compiled version, pass the argument -DUMFPACK_DIR=/path/to/umfpack to the cmake command.

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