That's so weird!! I thought this was all standardized.

Anybody know any way to make this portable across all the platforms?

When dealing with reals, you usually need to compare within a tolerance.
a == b
is equivalent to
a - b == 0
and to
|a - b| <= 0
With a tolerance, it becomes
|a - b| <= tol

Tolerance can be absolute
(e.g. tol = 0.0001)
or relative
(e.g. tol = a * 0.05)

In reply to Comparing Reals using a Tolerance by ikegami
in thread bug in Perl compilation? by bkgallo

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