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   AX_F90_MODULE_FLAG
  
Find Fortran 90 modules inclusion flag. The module inclusion flag is stored in the cached variable ax_f90_modflag. An error is triggered if the flag cannot be found. Supported are the -I GNU compilers flag, the -M SUN compilers flag, and the -p Absoft Pro Fortran compiler flag.
http://autoconf-archive.cryp.to/ax_f90_module_flag.m4
    Copyright © 2009 Luc Maisonobe <luc@spaceroots.org>
    Copyright © 2009 Julian C. Cummings
    <cummings@cacr.caltech.edu>
    Copyright © 2009 Alexander Pletzer <pletzer@txcorp.com>
   
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