Install problem

hi,

  i got this error while compiling PHP 5.3.10 on Redhat ES 4


lxml2 -lz -lm -lxml2 -lz -lm -lxml2 -lz -lm -lcrypt -lxml2 -lz -lm -lxml2
-lz -lm -lxml2 -lz -lm -lcrypt  -o sapi/cli/php
ext/standard/.libs/dns.o(.text+0x3c7): In function `zif_dns_check_record':
/usr/local/src/php-5.3.10/ext/standard/dns.c:403: undefined reference to
`__res_nsearch'
ext/standard/.libs/dns.o(.text+0x5db): In function `php_parserr':
/usr/local/src/php-5.3.10/ext/standard/dns.c:428: undefined reference to
`__dn_expand'
ext/standard/.libs/dns.o(.text+0x74e):/usr/local/src/php-5.3.10/ext/standard/dns.c:662:
undefined reference to `__dn_expand'
ext/standard/.libs/dns.o(.text+0x846):/usr/local/src/php-5.3.10/ext/standard/dns.c:523:
undefined reference to `__dn_expand'
ext/standard/.libs/dns.o(.text+0x895):/usr/local/src/php-5.3.10/ext/standard/dns.c:529:
undefined reference to `__dn_expand'
ext/standard/.libs/dns.o(.text+0xceb):/usr/local/src/php-5.3.10/ext/standard/dns.c:684:
undefined reference to `__dn_expand'
ext/standard/.libs/dns.o(.text+0x107a):/usr/local/src/php-5.3.10/ext/standard/dns.c:646:
more undefined references to `__dn_expand' follow
ext/standard/.libs/dns.o(.text+0x135a): In function `zif_dns_get_record':
/usr/local/src/php-5.3.10/ext/standard/dns.c:820: undefined reference to
`__res_nsearch'
ext/standard/.libs/dns.o(.text+0x13cf):/usr/local/src/php-5.3.10/ext/standard/dns.c:837:
undefined reference to `__dn_skipname'
ext/standard/.libs/dns.o(.text+0x18e9): In function `zif_dns_get_mx':
/usr/local/src/php-5.3.10/ext/standard/dns.c:937: undefined reference to
`__res_nsearch'
ext/standard/.libs/dns.o(.text+0x192a):/usr/local/src/php-5.3.10/ext/standard/dns.c:948:
undefined reference to `__dn_skipname'
ext/standard/.libs/dns.o(.text+0x195e):/usr/local/src/php-5.3.10/ext/standard/dns.c:955:
undefined reference to `__dn_skipname'
ext/standard/.libs/dns.o(.text+0x1a2a):/usr/local/src/php-5.3.10/ext/standard/dns.c:968:
undefined reference to `__dn_expand'
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1

  am i missing something? package?

tia,