Mercurial doesn't build on Leopard

[ndw@…]

$ sudo port install mercurial
...
--->  Attempting to fetch mercurial-0.9.5.tar.gz from http://www.selenic.com/mercurial/release/
--->  Verifying checksum(s) for mercurial
--->  Extracting mercurial
--->  Configuring mercurial
--->  Building mercurial with target build
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_mercurial/work/mercurial-0.9.5" && /opt/local/bin/python2.4 setup.py build " returned error 1
Command output: copying hgext/graphlog.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/hbisect.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/hgk.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/imerge.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/interhg.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/mq.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/notify.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/parentrevspec.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/patchbomb.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/purge.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/record.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/transplant.py -> build/lib.macosx-10.3-i386-2.4/hgext
copying hgext/win32text.py -> build/lib.macosx-10.3-i386-2.4/hgext
creating build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/__init__.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/common.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/cvs.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/darcs.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/filemap.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/git.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/hg.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/subversion.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
copying hgext/convert/transport.py -> build/lib.macosx-10.3-i386-2.4/hgext/convert
running build_ext
building 'mercurial.mpatch' extension
creating build/temp.macosx-10.3-i386-2.4
creating build/temp.macosx-10.3-i386-2.4/mercurial
-fno-strict-aliasing -Wno-long-double -no-cpp-precomp -fno-common -fno-common -dynamic -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -I/opt/local/Library/Frameworks/Python.framework/Versions/2.4/include/python2.4 -c mercurial/mpatch.c -o build/temp.macosx-10.3-i386-2.4/mercurial/mpatch.o
unable to execute -fno-strict-aliasing: No such file or directory
error: command '-fno-strict-aliasing' failed with exit status 1

Error: Status 1 encountered during processing.