Describe how to include the ATLAS version of BLAS.

git-svn-id: https://svn.dealii.org/trunk@15993 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/doc/readme.html b/deal.II/doc/readme.html
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@@ -696,8 +696,8 @@
     in the default locations of your system, and similarly for LAPACK.</p>
 
     <p>If your BLAS or LAPACK libraries are not in the standard search
-    path of your linker, you heve to linker where to find them. The
-    path is not given as an argument to
+    path of your linker, you have to tell the linker where to find them.
+    The path is not given as an argument to
     <code>--with-blas</code>. Rather, you set the variable
     <code>LDFLAGS</code> accordingly or make sure that the path is in
     your <code>LD_LIBRARY_PATH</code> or similar. For details, please
@@ -709,7 +709,23 @@
     <p> This example will search for a library
     <code>libmyblas.a</code> or <code>libmyblas.so</code> in the
     directory <code>/my/lib</code> and elswhere in the system library
-    paths.</p> </dd>
+    paths.</p>
+ 
+    <p>Some versions of BLAS and LAPACK need additional libraries 
+    to be linked with. Such an example is the 
+    <a href="http://math-atlas.sourceforge.net/">automatically tuned
+    linear algebra software (ATLAS)</a>. The BLAS version of this
+    package also needs declarations from <code>libatlas.a</code>, 
+    so it must be included. Using the standard library names of
+    atlas, the include for BLAS reads
+    <pre>
+    ./configure --with-blas='f77blas -latlas'
+    </pre>
+    assuming that <code>libf77blas.a</code> and <code>libatlas.a</code>
+    or the respective shared libraries <code>*.so</code> are in your 
+    <code>LD_LIBRARY_PATH</code>. LAPACK generated by ATLAS is
+    included in a similar fashion.</p> 
+    </dd>
 
     <a name="netcdf"></a>
     <dt>NetCDF</dt>