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Definitions
===========
* **Source tree:** The tree where the Open MPI source code is located.
It is typically the result of expanding an Open MPI distribution
source code bundle, such as a tarball.
* **Build tree:** The tree where Open MPI was built. It is always
related to a specific source tree, but may actually be a different
tree (:ref:`since Open MPI supports VPATH builds
<building-open-mpi-vpath-label>`). Specifically, this is the tree
where you invoked ``configure``, ``make``, etc. to build and install
Open MPI.
* **Installation tree:** The tree where Open MPI was installed. It is
typically the "prefix" argument given to Open MPI's ``configure``
script; it is the directory from which you run installed Open MPI
executables.
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