lang/php4-cli build failure

[Roman Neuhauser]

textproc/libxml2-2.5.10 knobs used:
    -DWITH_THREADS -DWITH_SCHEMA

lang/php4-cli-4.3.3 knobs used:
    -DBATCH PHP4_OPTIONS="BCMATH BZIP2 CDB CRACK CTYPE CURL DOMXML DOMXSLT FTP GD GETTEXT ICONV IMAP INIFILE MBSTRING MCRYPT MHASH MIME MYSQL OPENSSL OVERLOAD PCRE POSIX POSTGRESQL SESSION SOCKETS TOKENIZER XML XMLRPC ZIP ZLIB"

lang/php4-cli build fails with

configure:35980: checking for GNU gettext support
configure:36040: checking for bindtextdomain in -lintl
configure:36059: cc -o conftest -O2 -pipe    -R/usr/local/lib -L/usr/local/lib -L/usr/local/lib conftest.c -lintl  -lexslt -lxsltbreakpoint -lxml2 -lxslt -lz -lcurl -lcrack -lbz2 -lz -lssl -lcrypto -lm  -lcurl -lz -lssl -lcrypto -lz -lxml2 -lz -liconv -lm 1>&5
/usr/local/lib/libxml2.so: undefined reference to `pthread_cond_signal'
/usr/local/lib/libxml2.so: undefined reference to `pthread_getspecific'
/usr/local/lib/libxml2.so: undefined reference to `pthread_equal'
/usr/local/lib/libxml2.so: undefined reference to `pthread_once'
/usr/local/lib/libxml2.so: undefined reference to `pthread_key_create'
/usr/local/lib/libxml2.so: undefined reference to `pthread_cond_init'
/usr/local/lib/libxml2.so: undefined reference to `pthread_mutex_unlock'
/usr/local/lib/libxml2.so: undefined reference to `pthread_self'
/usr/local/lib/libxml2.so: undefined reference to `pthread_mutex_destroy'
/usr/local/lib/libxml2.so: undefined reference to `pthread_mutex_lock'
/usr/local/lib/libxml2.so: undefined reference to `pthread_cond_wait'
/usr/local/lib/libxml2.so: undefined reference to `pthread_mutex_init'
/usr/local/lib/libxml2.so: undefined reference to `pthread_setspecific'

provided the above is enough information, what's the quick fix?

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