Error while compiling apache on CentOS 5.5

I got the following error when I was trying to modify my existing installation of Apache. Only thing I changed was to add –with-expires to my configure. Here is the error:
libtool: link: cannot find the library `/usr/local/src/httpd-2.2.14/srclib/apr-util/xml/expat/lib/libexpat.la’ or unhandled argument `/usr/local/src/httpd-2.2.14/srclib/apr-util/xml/expat/lib/libexpat.la’
I was able to fix this error by adding: –with-expat=builtin
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