pango unable to upgrade due to libpng error

[yanokwa@…]

when i attempt to upgrade pango, it fails. i have attached the log to this ticket, but the relevant error is

:info:build /opt/local/bin/grep: /opt/local/lib/libpng12.la: No such file or directory
:info:build /opt/local/bin/gsed: can't read /opt/local/lib/libpng12.la: No such file or directory

i understand there is a problem with the libpng port from 1.2 to 1.4. i've tried all the suggestions below. none have worked.

sudo port clean pango
sudo port selfupdate
sudo port upgrade outdated
sudo port -n upgrade --force pango

[yanokwa@…]

fixed.

sudo port uninstall ghostscript;
sudo port uninstall cairo;
sudo port uninstall pango;
sudo port clean cairo ghostscript pango;
sudo port install cairo ghostscript pango;