trouble compiling php under solaris 7

I am trying to build and install up PHP 4.0.6 on my Ultra SPARC running Solaris 7. I have previously installed mysql and apache (with the so module) with success. I have configured php as: ./configure --with-mysql=/usr/local/mysql --with-apxs=/usr/local/apache/bin/apxs and it has run without error. make then proceeds along nicely through many files and directories, and then chokes in ./php-4.0.6/ext/xml reporting: /bin/sh /space/local/php-4.0.6/libtool --silent --mode=compile gcc -I. -I/space/local/php-4.0.6/ext/xml -I/space/local/php-4.0.6/main -I/space/local/php-4.0.6 -I/usr/local/apache1.3.20/include -I/space/local/php-4.0.6/Zend -I/usr/local/mysql/include -I/space/local/php-4.0.6/ext/xml/expat/xmltok -I/space/local/php-4.0.6/ext/xml/expat/xmlparse -I/space/local/php-4.0.6/TSRM -D_POSIX_PTHREAD_SEMANTICS -DSOLARIS2=270 -DUSE_EXPAT -DSUPPORT_UTF8 -DXML_BYTE_ORDER=21 -g -O2 -c xml.c /bin/sh /space/local/php-4.0.6/libtool --silent --mode=link gcc -I. -I/space/local/php-4.0.6/ext/xml -I/space/local/php-4.0.6/main -I/space/local/php-4.0.6 -I/usr/local/apache1.3.20/include -I/space/local/php-4.0.6/Zend -I/usr/local/mysql/include -I/space/local/php-4.0.6/ext/xml/expat/xmltok -I/space/local/php-4.0.6/ext/xml/expat/xmlparse -I/space/local/php-4.0.6/TSRM -D_POSIX_PTHREAD_SEMANTICS -DSOLARIS2=270 -DUSE_EXPAT -DSUPPORT_UTF8 -DXML_BYTE_ORDER=21 -g -O2 -o libxml.la xml.lo expat/libexpat.la ar: archive, /space/local/php-4.0.6/ext/xml/expat/.libs/libexpat.al, not found I cannot figure out what is going wrong. Any assistance in identifying this problem and getting php up and running will be greatly appreciated. Thanks, - Mike