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/usr/lib/fortc/irix.m4 is in libxgks-dev 2.6.1+dfsg.2-3ubuntu1.

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divert(-1)
define(`M4__SYSTEM', IRIX)
define(`M4__FORTRAN_DEFINES',
`
#define FORTRAN_HAS_NO_BYTE
')
# transformation from fortran name to name of C module
define(`NAMEF',`$1_')	# for Sun and most unixes, just append an underscore
# transformation from string name to corresponding argument name
define(`STRINGF',`$1')
# extra arguments, if any, for argument lengths
define(`STRINGX',`, $1_len')  # one extra stringlen parameter
define(`REALX',`')
define(`INTEGERX',`')
define(`FUNCTIONX',`')
define(`DOUBLEX',`')
# declaration to be used for argument name descriptor
define(`STRINGD',`
    char      *$1;
    int        $1`'`_len';') # declare argument string with extra stringlen parameter
# declarations and initializations of canonical local variables
define(`STRINGL',`')
# FORTRAN declaration for a long integer (e.g. integer*4 for Microsoft)
define(`LONG_INT',`integer')
# FORTRAN declaration for a short integer (e.g. integer*2)
define(`SHORT_INT',`integer*2')
# FORTRAN declaration for an integer byte (e.g. integer*1 or byte)
define(`BYTE_INT',`integer')
# FORTRAN declaration for double precision (e.g. real for a Cray)
define(`DOUBLE_PRECISION',`double precision')
# FORTRAN syntax for including a file
define(`M4__RIGHT_QUOTE',')
define(`F_INCLUDE',`      `include' M4__RIGHT_QUOTE`'$1`'M4__RIGHT_QUOTE')
divert(0)dnl