Works fine on my box (Mac OS X, perl 5.8). I'm afraid I don't have enough XS-fu to offer any advice on getting it running. Might be worth submitting a bug report.

May not be what you're looking for anyway... from the C source:

/*
 * WARNING: depending on the particular platform, truerand() output ma
+y
 * be biased or correlated.  In general, you can expect about 16 bits 
+of
 * "pseudo-entropy" out of each 32 bit word returned by truerand(),
 * but it may not be uniformly diffused.  You should therefore run
 * the output through some post-whitening function (like MD5 or DES or
 * whatever) before using it to generate key material.  (RSAREF's
 * random package does this for you when you feed truerand() bits to t
+he
 * seed input function.)
 *
 * Test these assumptions on your own platform before fielding a syste
+m
 * based on this software or these techniques.
 *
 * This software seems to work well (at 16 bits per truerand() call) o
+n
 * a Sun Sparc-20 under SunOS 4.1.3 and on a P100 under BSDI 2.0.  You
+'re
 * on your own elsewhere.
 */
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