The C program text requires 
#include <XSUB.h>

[download]

for a threaded Perl (tried with 5.6.1 & 5.7.2 on FreeBSD 4.3-STABLE)

This probably should be in the perlembed man page

In reply to Re: Help building embedded threaded perl 5.6.1 (was: Stanley Hopcroft) by Anonymous Monk
in thread Help building embedded threaded perl 5.6.1 (was: Stanley Hopcroft) by Anonymous Monk

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