I tried to compile Apache 2.2.9 on a Quicksilver 800 with OS X 10.4.11 and I received the following:
williams-place:~/Desktop/httpd-2.2.9 wKanoff$ CFLAGS="-arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -Wno-pointer-sign" \
> ./configure \
> --enable-layout=William \
> --enable-mods-shared=all \
> --with-ssl=/usr \
> --with-mpm=prefork \
> --enable-ssl \
> --enable-dav \
> --enable-cache \
> --enable-proxy \
> --enable-shared \
> --disable-static \
> --disable-unique-id \
> --disable-ipv6 \
> --enable-logio \
> --enable-deflate \
> --with-ldap \
> --with-ldap-include=/usr/include \
> --with-ldap-lib=/usr/lib \
> --with-included-apr \
> --enable-ldap \
> --enable-auth-ldap \
> --enable-cgi \
> --enable-cgid \
> --enable-suexec
configure: WARNING: Unrecognized options: --enable-shared, --disable-static, --disable-ipv6, --with-ldap, --with-ldap-include, --with-ldap-lib, --enable-auth-ldap

You are correct, I've received these warnings as well. It's nothing to worry about, the configure options have changed a bit and those options are now obsolete. It will compile without any problem. I will remove them from the documentation set.