error while installing mod_ruby from macports

[chutsu@…]

I get the following error while compiling mod_ruby:

--->  Fetching mod_ruby
--->  Verifying checksum(s) for mod_ruby
--->  Extracting mod_ruby
--->  Configuring mod_ruby
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_www_mod_ruby/work/mod_ruby-1.2.6" && ./configure.rb --prefix=/opt/local --with-apxs=/opt/local/apache2/bin/apxs --with-apr-includes=/opt/local/include/apr-1 " returned error 1
Command output: ./configure.rb:324: private method `gsub!' called for nil:NilClass (NoMethodError)

Error: Status 1 encountered during processing.