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I thought I would share my experience getting this to work for solaris.
It seems that this has been a recurring problem.

Net::SFTP depends upon Net::SSH(protocol 2). This in turn depends upon
a
number of packages. But Math:ari was the fun one to build.
Math:ari requires libpari. On my system(gcc version 3.4.3 SunOS 5.
I was only able to build the "c" version of the library. There are
tuned versions of the routines which use assembler. But I found that
the
assembler versions would not build on my compiler.

So now I thought I was done, and if I were a patient person I would
have
been. The problem was that the key generation was horribly slow. After
digging into which calls were taking so long I discovered that even
though
I had successfully installed Math:ari it wasn't being used.
Apparently you
need Math::BigInt:ari. This overrides the core of Math::BigInt with a
pari
implementation. So I tried this but I got the following error:
_is_zero
Not an ARRAY reference at
/opt/local/perl/5.8/lib/5.8.6/Math/BigInt/Calc.pm line 998.
I tried various combinations of Math::BigInt, Math::BigInt:ari
versions
but all failed for me.

So then I decided to try Math::BigInt::GMP. I noticed that Crypt:H
actually
prefers GMP(from DH.pm use Math::BigInt lib => "GMP,Pari"
I believe that part of building libpari I build libgmp. Also I read
that
Math::BigInt::GMP also replaces the slow implementation of BigInt with
c code.

Eureka! It finally worked. Although I never got pari supported, at
least within
SFTP, I did get SFTP working which was my goal. I hope this helps, here
are
the package versions I am running:

Math::BigInt::GMP v1.17
Math::GMP v2.04
Math:ari v2.010602
Math::BigInt v1.74
Math::BigInt:ari v1.10 also tried v1.11
Math::BigInt::GMP v1.17
gmp-4.1
pari-2.1.6

Regards,
Tom