Description:
------------
I am having difficulties getting past the libxml build check when configuring PHP.  I have installed libxml version 2.6.23 and am attempting to run the configure script for PHP version 5.1.2.  I have seen other bug reports similar to this, but none of the recommended fixes seem to address my problem.

Below is the complete configure commandline:

./configure --with-apxs=/home/dcenker/AMP/apache/bin/apxs --with-mysqli=/home/dcenker/AMP/mysql/bin/mysql_config --enable-mbstring --enable-soap --with-libxml-dir=/home/dcenker/libxml

where /home/dcenker/libxml/bin contains the xml2-config executable.  The last few lines of the config.log file are as follows:

Any help in resolving this installation issue would be greatly appreciated.  If you need any additional information, please let me know.  Thank you.

Actual result:
--------------
<<<begin config.log excerpt>>>

configure:18440: checking whether to enable LIBXML support
configure:18487: checking libxml2 install dir
configure:18647: checking whether libxml build works
configure:18674: gcc -o conftest -g -O2  -D_POSIX_PTHREAD_SEMANTICS  -R/usr/ucbli
b -L/usr/ucblib -R/apps/gcc-3.0.4/lib/gcc-lib/sparc-sun-solaris2.7/3.0.4 -L/apps/
gcc-3.0.4/lib/gcc-lib/sparc-sun-solaris2.7/3.0.4 -R/home/dcenker/libxml/lib -L/ho
me/dcenker/libxml/lib conftest.c

         -lresolv -lm -ldl -lnsl -lsocket  -lgcc -lxml2 -lz -lm -lsocket -lnsl 1>
&5
configure: failed program was:
#line 18663 "configure"
#include "confdefs.h"


    char xmlInitParser();
    int main() {
      xmlInitParser();
      return 0;
    }

<<<end config.log excerpt>>>