Upgrade coreutils failed - Leopard

[Thorsten Zörner]

MacBook Pro, Intel CoreDuo, 2 GHz, MacOS 10.5, MacPorts 1.520


Just got my Leopard installed yesterday,
checking for outdated ports... coreutils
Fine so far, then this happens:

Macintosh:~ thorsten$ sudo port upgrade coreutils
Password:
--->  Configuring coreutils
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_sysutils_coreutils/work/coreutils-6.9"  
&& ./configure --prefix=/opt/local --program-prefix=g --disable-nls "  
returned error 77
Command output: checking build system type... i386-apple-darwin9.0.0
checking host system type... i386-apple-darwin9.0.0
configure: autobuild project... GNU coreutils
configure: autobuild revision... 6.9
configure: autobuild hostname... Macintosh.local
configure: autobuild timestamp... 20071031-184539
checking for a BSD-compatible install... /opt/local/bin/ginstall -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /opt/local/bin/gmkdir -p
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking for C compiler default output file name...
configure: error: C compiler cannot create executables
See `config.log' for more details.

Error: Unable to upgrade port: 1
Macintosh:~ thorsten$

What seems to be the problem?
Cheers, Thorsten.