Macports e glib2

[masteryuri]

Do un "port upgrade outdated" e durante la configurazione mi viene fuori questo errore:

MacBookPro:~ yuri$ sudo port upgrade outdated
Warning: Skipping upgrade since boehmgc 7.1_0 >= boehmgc 7.1_0, even though installed variants "+darwin_9" do not match "+darwin_10". Use 'upgrade --enforce-variants' to switch to the requested variants.
Warning: Skipping upgrade since openssl 0.9.8k_0 >= openssl 0.9.8k_0, even though installed variants "" do not match "+darwin". Use 'upgrade --enforce-variants' to switch to the requested variants.
Warning: Skipping upgrade since ncursesw 5.7_0 >= ncursesw 5.7_0, even though installed variants "" do not match "+darwin_10". Use 'upgrade --enforce-variants' to switch to the requested variants.
Warning: Skipping upgrade since ncurses 5.7_0 >= ncurses 5.7_0, even though installed variants "" do not match "+darwin_10". Use 'upgrade --enforce-variants' to switch to the requested variants.
---> Computing dependencies for glib2
---> Configuring glib2
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_devel_glib2/work/glib-2.20.5" && ./configure --prefix=/opt/local --enable-static " returned error 1
Command output: checking dependency style of /usr/bin/gcc-4.2... (cached) gcc3
checking how to run the C preprocessor... /usr/bin/gcc-4.2 -E
checking for c++... /usr/bin/g++-4.2
checking whether we are using the GNU C++ compiler... yes
checking whether /usr/bin/g++-4.2 accepts -g... yes
checking dependency style of /usr/bin/g++-4.2... gcc3
checking for gcc... (cached) /usr/bin/gcc-4.2
checking whether we are using the GNU C compiler... (cached) yes
checking whether /usr/bin/gcc-4.2 accepts -g... (cached) yes
checking for /usr/bin/gcc-4.2 option to accept ISO C89... (cached) none needed
checking dependency style of /usr/bin/gcc-4.2... (cached) gcc3
checking whether /usr/bin/gcc-4.2 and cc understand -c and -o together... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for pkg-config... /opt/local/bin/pkg-config
checking for gawk... (cached) gawk
checking for perl5... /opt/local/bin/perl
checking for indent... indent
checking for /opt/local/bin/perl... /opt/local/bin/perl
checking for a Python interpreter with version >= 2.4... python
checking for python... /usr/bin/python
checking for python version... 2.6
checking for python platform... darwin
checking for python script directory... ${prefix}/lib/python2.6/site-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.6/site-packages
checking for iconv_open... no
checking for libiconv_open in -liconv... no
checking for iconv_open in -liconv... no
configure: error: *** No iconv() implementation found in C library or libiconv

Error: Unable to upgrade port: 1

Come mi comporto??