You need to re-compile Apache, adding the following option (don't ask me why :)

--disable-rule=EXPAT
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Eg, in my case, I cd'd to my mod_perl src directory and entered:

perl Makefile.PL USE_APACI=1 EVERYTHING=1 DO_HTTPD=1 SSL_BASE=/usr/loc
+al/ssl \
APACHE_PREFIX=/usr/local/apache APACHE_SRC=../apache_1.3.27/src \
APACI_ARGS='--enable-module=ssl,--enable-module=rewrite,--disable-rule
+=EXPAT,--enable-module=so

make && make test && make install
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Your particular set-up will probably vary.

.02

cLive ;-)