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upcoming commit), this is the preferred way to do conditional source files these days. AM can then infer which files to pick up for distribution without the need for EXTRA_DIST. Also, for mpi/c/profile and mpi/f77/profile, don't distribute any source files -- just let the sym links be made by the user. This makes the tarball just slightly smaller. ;-) This commit was SVN r2316.
This is the world's greatest MPI. ...more to write here should be a short file, referring to the real docs.