What is endian.h? and how can I get it?

[btna]

Hello all,

I have been trying to install Net::SFTP for 3 weeks now and everytime I
seem to solve an issue, another one comes up. I am running AIX 5.1 and
I found out that the Math:ari module needed Perl 5.8.0. I am finally
down to compiling Crypt::IDEA. This is the only one I have left to
start compiling Net:SSH.
I get the following when I do "make":

_idea.c:8: endian.h: A file or directory in the path name does not
exist.
make: 1254-004 The error code from the last command is 1.

Any ideas what this include file is for and How can I get it? I don't
have in my system? is ot possible to change it?

Thanks in advance,

BTNA