php5 will not compile in FBSD 5.3

[O. Hartmann]

Hello.
I try to compile PHP 5.0.3 (and the port) and I get this error in 
FreeBSD 5.3-STABLE:

ext/standard/dns.lo(.text+0x1d49): In function `.L166':
: undefined reference to `res_ninit'
ext/standard/dns.lo(.text+0x1db5): In function `.L166':
: undefined reference to `res_nmkquery'
ext/standard/dns.lo(.text+0x1de7): In function `.L166':
: undefined reference to `res_nsend'
ext/standard/dns.lo(.text+0x1f6a): In function `.L166':
: undefined reference to `res_nclose'
*** Error code 1

I found some threads about BIND8/9 dependencies, but no solution. PHP 
compiled in 5.2.1 and 5.3-RELEASE and won't compile in 5.3-STABLE. Why?

Thanks,
Oliver