apple-gcc42 fails to build with Xcode 4.2 (Lion)

[rinderknecht@…]

My configuration is a fresh Lion release on a new Mac Mini:

~$ uname -a 
Darwin dorongnyong.local 11.2.0 Darwin Kernel Version 11.2.0: Tue Aug  9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64 x86_64

~$ sudo port install texlive

leads to

[...]
--->  Fetching apple-gcc42

--->  Attempting to fetch gcc-5666.3.tar.gz from 
http://distfiles.macports.org/apple-gcc42

--->  Verifying checksum(s) for apple-gcc42

--->  Extracting apple-gcc42

--->  Applying patches to apple-gcc42

--->  Configuring apple-gcc42

--->  Building apple-gcc42

Error: Target org.macports.build returned: shell command failed (see log for details)

Error: Failed to install apple-gcc42

Log for apple-gcc42 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_apple-gcc42/apple-gcc42/main.log

Error: The following dependencies were not installed: [...]

Thanks for your help.

Christian