subversion 1.5.5 configure error on OSX 10.5

[henuyken@…]

Configuring subversion
Error: Target org.macports.configure returned: configure failure: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_subversion/work/subversion-1.5.5" && ./configure --prefix=/opt/local --with-apr=/opt/local/bin/apr-1-config --with-apr-util=/opt/local/bin/apu-1-config --mandir=\${prefix}/share/man --disable-neon-version-check --with-serf=/opt/local --with-sasl=/opt/local --with-apxs=/opt/local/apache2/bin/apxs --disable-mod-activation -
-without-neon --without-berkeley-db --with-apxs=/opt/apache2/bin/apxs --disable-mod-activation --disable-keychain " returned error 1
Command output: configure: Configuring Subversion 1.5.5
configure: creating config.nice
checking for gcc... /usr/bin/gcc-4.0
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are
 using the GNU C compiler... yes
checking whether /usr/bin/gcc-4.0 accepts -g... yes
checking for /usr/bin/gcc-4.0 option to accept ISO C89... none needed
checking how to run the C preprocessor... /usr/bin/cpp-4.0
checking build system type... powerpc-apple-darwin9.6.0
checking host system type... powerpc-apple-darwin9.6.0
checking target system type... powerpc-apple-darwin9.6.0
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether ln -s 
works... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for static Apache module support... no
checking for Apache module support via DSO through APXS... ./configure: line 3936: /opt/apache2/bin/apxs: No such file or directory
configure: error: no - APXS refers to an old version of Apache
                     Unable to locate /mod_dav.h
Error: Status 1 encountered during processing.
Executing: /opt/local/bin/port install subversion +bash_completion +darwin_7 +mac_os_x_server_mod_dav_svn +mod_dav_svn +no_bdb +no_neon +tools +unicode_path