Error while building perl5 on linux

[marco j <marcojasso%gmail.com@localhost>]

Hello, I've been trying to build perl5 using pkgsrc on ubuntu linux and this
error just came out, I have try many things but no look so far:


perlmini.c:(.text+0x3345): undefined reference to `pthread_key_delete'
collect2: ld returned 1 exit status
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/lang/perl5/work/perl-5.12.2
*** Error code 1