irssi, ld-elf.so.1, and perl something

[Aaron Peterson]

/usr/libexec/ld-elf.so.1: irssi: Undefined symbol "Perl_eval_pv"

this is the error i'm receiving when i try to run irssi installed from
ports.  it used to work and has broken recently, perhaps through some
complication with buildworld or portupgrade -arR.  In any case, i'm
running fbsd 4.9 with a generic kernel (minus cpu i386, 486, and 586). 
Since i noticed this problem, i've rebuilt the world and the kernel,
rebuilt perl, and rebuilt irssi.  no luck.  i'm not sure what this error
means exactly, perhaps that information is key to solving my problem :)

Aaron