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m4 : Here, you install any new 'm4'files that your package may want to install.
     These files define new 'autoconf' commands that you may want to make available
     to other developpers who want to use your libraries.
[...]

src : sources code.

include : [...] here you can link all public header files in all the subdirectories under src
      to this directory. This way it will only be necessary to pass one -I flag to test
      suites that want to access the include files of other libraries in the distribution.
[...]
lib : put here portability-related source code.

could it be possible to take it directory structure for grass51? 



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