python25, python26 fail to build on lion with Xcode 4.2

[twoboxen@…]

:info:build *** WARNING: renaming "_ctypes" since importing it failed: dlopen(build/lib.macosx-10.7-x86_64-2.5/_ctypes.so, 2): Symbol not found: _ffi_call
:info:build   Referenced from: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/work/Python-2.5.6/build/lib.macosx-10.7-x86_64-2.5/_ctypes.so
:info:build   Expected in: flat namespace
:info:build  in /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/work/Python-2.5.6/build/lib.macosx-10.7-x86_64-2.5/_ctypes.so
:info:build /bin/sh: line 1: 69328 Segmentation fault: 11  DYLD_FRAMEWORK_PATH=/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/work/Python-2.5.6: CC='/Developer/usr/bin/llvm-gcc-4.2' LDSHARED='/Developer/usr/bin/llvm-gcc-4.2 -arch x86_64 -L/opt/local/lib -arch x86_64 -bundle -undefined dynamic_lookup' OPT='-DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes' ./python.exe -E ./setup.py --no-user-cfg build
:info:build make: *** [sharedmods] Error 139
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/work/Python-2.5.6'
:info:build shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/work/Python-2.5.6" && /usr/bin/make -j2 -w all MAKE="/usr/bin/make" CC="/Developer/usr/bin/llvm-gcc-4.2" " returned error 2
:error:build Target org.macports.build returned: shell command failed (see log for details)
:debug:build Backtrace: shell command failed (see log for details)
    while executing
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
:info:build Warning: the following items did not execute (for python25): org.macports.activate org.macports.build org.macports.destroot org.macports.install
:notice:build Log for python25 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python25/python25/main.log