Installing Sitebuilder on Fedora Core 3 x86_64

[jsoderba]

I'm trying to get sitebuilder to work on a Fedora Core 3/x86_64 system. I've compiled all the required PHP extensions, but when I try to load the site I get

Call to undefined function: xslt_set_encoding()

The PHP manual tells me this error occurs when Sablotron isn't compiled with "encoding" support which I guess means iconv, but I specified the --with-iconv configure parameter for both PHP and Sablotron and the xslt.so module is linked to libiconv.so

$ ldd /usr/lib64/php4/xslt.so
        libsablot.so.0 => /usr/local/lib/libsablot.so.0 (0x00002aaaaabb5000)
        libjs.so.1 => /usr/lib64/libjs.so.1 (0x00002aaaaada0000)
        libiconv.so.2 => /usr/local/lib/libiconv.so.2 (0x00002aaaaaf29000)
        libexpat.so.0 => /usr/lib64/libexpat.so.0 (0x00002aaaab103000)
        libc.so.6 => /lib64/tls/libc.so.6 (0x00002aaaab226000)
        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002aaaab459000)
        libm.so.6 => /lib64/tls/libm.so.6 (0x00002aaaab649000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002aaaab7d0000)
        /lib64/ld-linux-x86-64.so.2 (0x0000555555554000)

Any ideas? I'm stumped.