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(g77-295.info)C Access to Type Information

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Accessing Type Information in C
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   Generally, C code written to link with `g77' code--calling and/or
being called from Fortran--should `#include <g2c.h>' to define the C
versions of the Fortran types.  Don't assume Fortran `INTEGER' types
correspond to C `int's, for instance; instead, declare them as
`integer', a type defined by `g2c.h'.  `g2c.h' is installed where `gcc'
will find it by default, assuming you use a copy of `gcc' compatible
with `g77', probably built at the same time as `g77'.