The X10 SVN trunk now uses properties files (found in x10.dist/etc) to select 
post-compiler command line options. The options discovered in this fashion are 
the options prescribed by the transport layer only. Other things specific to 
the X10 c++ code-gen e.g., SSE flags on x86, and optimisation flags, etc., are 
currently still supplied by x10c++.

The -x10rt command-line option of x10c++ now selects the properties file. Valid 
options include:

* mpi
* standalone
* pgas_sockets
* pgas_lapi
* pgas_bgp

Not all PGAS options are available on all platforms.  MPI is only available if 
you run ant with -DX10RT_MPI=true.  The default is still pgas_sockets on all 
platforms. The properties file is found using this expansion: 

x10.dist/etc/x10rt_%s.properties

Note that you can also give the path to a properties file instead of one of the 
above strings. The file name must end in ".properties".  You should not put 
your own properties files in x10.dist/etc if you intend to run ant distclean, 
because they will be wiped.  However you can create your own properties file 
anywhere else, that instructs x10c++ to use whatever PGAS build you like, or 
any other implementation of the X10RT specification.

For this reason we have retired the X10LIB environment var.  PGAS is currently 
always searched for in the pgas2 directory in the root of the tree.  If the 
PGAS libraries are installed in x10.dist/lib they should also be found, as this 
is in the post-compiler's library search path.

We have retired the X10_FROM_SRC environment var.  Now everything needs to be 
in x10.dist/lib or x10.dist/include.

If this is the first you've heard of these environment variables, these changes 
should not affect you.

thanks
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