python25 +universal fails to compile Mac OS 10.4

[wjb@…]

I previously installed MacPorts python2.5 and am trying to switch to +universal variant. Running the command:

sudo port install python25 +universal

installation fails with

--->  Building python25 with target all
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_python25/work/Python-2.5.1" && make all " returned error 2
Command output: libtool -o libpython2.5.dylib -dynamic  \
        -all_load libpython2.5.a -single_module \
        -install_name /opt/local/lib/libpython2.5.dylib \
        -compatibility_version 2.5 \
        -current_version 2.5 -lSystem -lSystemStubs -arch i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk -L/opt/local/lib
libtool: unknown option character `r' in: -arch
Usage: libtool -static [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-sacLT]
Usage: libtool -dynamic [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-o output] [-install_name name] [-compatibility_version #] [-current_version #] [-seg1addr 0x#] [-segs_read_only_addr 0x#] [-segs_read_write_addr 0x#] [-seg_addr_table <filename>] [-seg_addr_table_filename <file_system_path>] [-all_load] [-noall_load]
make: *** [libpython2.5.dylib] Error 1

Error: Status 1 encountered during processing.

My specs: MacPorts 1.520 Mac OS 10.4 Intel Xcode 2.4.1

Any idea on what could be wrong here?