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.
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