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(automake.info)Preprocessing Fortran 77

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Preprocessing Fortran 77
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   `N.f' is made automatically from `N.F' or `N.r'.  This rule runs
just the preprocessor to convert a preprocessable Fortran 77 or Ratfor
source file into a strict Fortran 77 source file.  The precise command
used is as follows:

`.F'
     `$(F77) -F $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS)
     $(AM_FFLAGS) $(FFLAGS)'

`.r'
     `$(F77) -F $(AM_FFLAGS) $(FFLAGS) $(AM_RFLAGS) $(RFLAGS)'