Solved adding a line relative to crypt library in option.mk:

.if !empty(PKG_OPTIONS:Mpam)
.include "../../mk/pam.buildlink3.mk"
LIBS+=          -L${PAMBASE}
LIBS+=          ${COMPILER_RPATH_FLAG}${PAMBASE}
LIBS+=          -lpam
.else
SUBST_CLASSES+=         pam
SUBST_FILES.pam=        builddefs.h
SUBST_SED.pam+=         -e 's,define VSF_BUILD_PAM,undef VSF_BUILD_PAM,g'
SUBST_STAGE.pam=        pre-configure
LIBS+=          -lcrypt              <<<< ADDED
.endif

I don't know if this is the right way of doing the job :-)
te0x


----- Original Message ----- 
From: <snj@netbsd.org>
To: <linux-pkg-people@NetBSD.org>; <pkg-manager@netbsd.org>; 
<pkgsrc-bugs@netbsd.org>; <gnats-admin@netbsd.org>; <snj@netbsd.org>; 
<info@sicurezzarete.com>
Sent: Saturday, June 24, 2006 9:50 PM
Subject: Re: pkg/33801 (vsftpd compilation on linux error)


> Synopsis: vsftpd compilation on linux error
>
> Responsible-Changed-From-To: pkg-manager->linux-pkg-people
> Responsible-Changed-By: snj@netbsd.org
> Responsible-Changed-When: Sat, 24 Jun 2006 19:50:39 +0000
> Responsible-Changed-Why:
> Linux-specific problem.
>
>
>
>