Iperf configure failure: "C++ compiler cannot create executables"

[cgist@…]

Mac OSX verison 10.6.2 iperf-2.0.4

manhattan:~ cgist$ sudo port install -d iperf
Password:
--->  Computing dependencies for iperf
--->  Configuring iperf
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_net_iperf/work/iperf-2.0.4" && ./configure --prefix=/opt/local " returned error 77
Command output: checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... no
checking for C++ compiler default output file name... configure: error: C++ compiler cannot create executables
See `config.log' for more details.

Error: Status 1 encountered during processing.
Before reporting a bug, first run the command again with the -d flag to get complete output.

[jmr@…]

Please remember to preview and use WikiFormatting, fill in the Port field, and cc the maintainer.

Please attach the config.log.

[jmr@…]

No response; closing.