Often, a software project will have one or more central repositories, directory trees that contain source code, or derived files, or both. You can eliminate additional unnecessary rebuilds of files by having SCons use files from one or more code repositories to build files in your local build tree.
Repository Method
It's often useful to allow multiple programmers working
on a project to build software from
source files and/or derived files that
are stored in a centrally-accessible repository,
a directory copy of the source code tree.
(Note that this is not the sort of repository
maintained by a source code management system
like BitKeeper, CVS, or Subversion.)
You use the Repository method
to tell SCons to search one or more
central code repositories (in order)
for any source files and derived files
that are not present in the local build tree:
env = Environment()
env.Program('hello.c')
Repository('/usr/repository1', '/usr/repository2')
Multiple calls to the Repository method
will simply add repositories to the global list
that SCons maintains,
with the exception that SCons will automatically eliminate
the current directory and any non-existent
directories from the list.