I had the same problem on my IPX, so I simply break install script and untar
snapshot. But I encounterd  enother problem with libposix.so, when compile
perl5:
This simple program (try.c from perl5)
#include <stdio.h>

main()
{exit(0);}

when compiled as `cc -O2 -o ttr try.c -lm -lposix -lcrypt' give 
Segmentation fault.
If it is compiled with static version of libposix all ok.

Anatoly