[Radiusplugin-users] plugin error on FreeBSD 7.2

[Volvo240]

I got next error while start OpenVPN server with RADIUS support:

Mon Apr  5 18:56:54 2010 PLUGIN_INIT: could not load plugin shared object 
/usr/local/etc/openvpn/radiusplugin.so: /usr/local/etc/openvpn/radiusplugin.so: 
Undefined symbol "pthread_create": No such file or directory (errno=2)
Mon Apr  5 18:56:54 2010 Exiting

$ uname -a
FreeBSD gw.local 7.3-STABLE FreeBSD 7.3-STABLE


$ sudo ldd  /usr/local/etc/openvpn/radiusplugin.so
/usr/local/etc/openvpn/radiusplugin.so:
        libgcrypt.so.16 => /usr/local/lib/libgcrypt.so.16 (0x28300000)
        libgpg-error.so.0 => /usr/local/lib/libgpg-error.so.0 (0x281e2000)
        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x28378000)
        libm.so.5 => /lib/libm.so.5 (0x281e6000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x2846d000)
        libc.so.7 => /lib/libc.so.7 (0x28083000)
        libintl.so.8 => /usr/local/lib/libintl.so.8 (0x28478000)
        libiconv.so.3 => /usr/local/lib/libiconv.so.3 (0x2848a000)

Any ideas ?
Mike.