From 4953f971f2d53ed661479c8d174c3d075ba124b0 Mon Sep 17 00:00:00 2001
From: Giovanni Bussi <giovanni.bussi@gmail.com>
Date: Fri, 5 Jun 2015 17:42:21 +0200
Subject: [PATCH] doc for internal lapack with external blas

---
 user-doc/Installation.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/user-doc/Installation.txt b/user-doc/Installation.txt
index d2f9a86e8..9a54fbd36 100644
--- a/user-doc/Installation.txt
+++ b/user-doc/Installation.txt
@@ -153,8 +153,17 @@ used by PLUMED.
 If you wish to disable any search for external libraries
 (e.g. because the system libraries have problems) this can be done with
 \verbatim
+> ./configure --disable-external-blas
+\endverbatim
+Notice that you can also disable external lapack only, that is use internal lapack with external blas
+using
+\verbatim
 > ./configure --disable-external-lapack
 \endverbatim
+Since typically it is the blas library that can be heavily optimized, this configuration
+should not provide significant slowing down and could be used on systems where
+native lapack libraries have problems.
+
 
 As a final resort, you can also edit the resulting Makefile.conf file.
 Notable variables in this file include:
-- 
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