note that we need the Cactus (perl) preprocessor to compile with icc on xeons

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinInitialData/Exact/trunk@161 e296648e-0e4f-0410-bd07-d597d9acff87

1 files changed, 14 insertions, 1 deletions

diff --git a/README b/README
index ea59f71..4dad600 100644
--- a/README
+++ b/README
@@ -4,7 +4,8 @@ Maintainer : Jonathan Thornburg <jthorn@aei.mpg.de>
 CVS info   : $Header$
 --------------------------------------------------------------------------
 
-Purpose of the thorn:
+Purpose of the thorn
+====================
 
 The initial purpose of this thorn was the comparison of numerical
 spacetimes against exact solutions.  One particular solution,
@@ -27,6 +28,18 @@ convert old parameter files to use the new names, renaming the old
 parameter files to ".par.bak" as backups.
 
 
+Compilation
+===========
+
+On some systems (notably the AEI Xeons using the Intel compilers) this
+thorn only compiles if you use the Cactus (perl) preprocessor, i.e. you
+need to configure with
+
+gmake foo-config CPP='$${PERL} $${CCTK_HOME}/lib/sbin/cpp.pl'
+
+(along with any other configuration options).
+
+
 Copyright
 =========