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   AX_F90_MODULE_EXTENSION
  
Find Fortran 90 modules file extension. The module extension is stored in the cached variable ax_f90_modext, or "unknown" if the extension cannot be found.
http://autoconf-archive.cryp.to/ax_f90_module_extension.m4
    Copyright © 2009 Luc Maisonobe <luc@spaceroots.org>
    Copyright © 2009 Alexander Pletzer <pletzer@txcorp.com>
   
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