QT4 appears to be broken

[Steve Kargl]

I thought I would try out libreoffice.  So,
as root I did

cd /usr/opt
ln -s /usr/opt /opt
csup ~/supfile.ports
cd /use/ports
make fetchindex
cd /usr/ports/editors/libreoffice
make PREFIX=/opt/

<several hours later, I see>

===>  Installing for qt4-qmake-4.7.3
===>   Generating temporary packing list
===>  Checking if devel/qmake4 already installed
mkdir -p "/opt//share/qt4"
cp -Rp /usr/ports/devel/qmake4/work/qt-everywhere-opensource-src-4.7.3/mkspecs /opt//share/qt4
install -s -o root -g wheel -m 555   qmake-qt4 /opt//bin
/bin/ln -sf /opt//share/qt4/mkspecs/freebsd-g++ /opt//share/qt4/mkspecs/default
===>   Registering installation for qt4-qmake-4.7.3
===>   Returning to build of qt4-moc-4.7.3
===>  Configuring for qt4-moc-4.7.3
/usr/bin/sed -i.bak -e 's|target.path.*|target.path=/opt//bin|g'  -e 's|^TARGET.*|TARGET=moc-qt4|g'  /usr/ports/devel/qt4-moc/work/qt-everywhere-opensource-src-4.7.3/src/tools/moc/moc.pro
/bin/mkdir -p /usr/ports/devel/qt4-moc/work/qt-everywhere-opensource-src-4.7.3/mkspecs
/bin/ln -sf /usr/local/bin/qmake-qt4 /usr/ports/devel/qt4-moc/work/qt-everywhere-opensource-src-4.7.3/bin/qmake

   The specified system/compiler is not supported:

      /usr/ports/devel/qt4-moc/work/qt-everywhere-opensource-src-4.7.3/mkspecs//usr/local/share/qt4/mkspecs/freebsd-g++

   Please see the README file for a complete list.

===>  Script "configure" failed unexpectedly.
Please report the problem to kde at FreeBSD.org [maintainer] and attach the
"/usr/ports/devel/qt4-moc/work/qt-everywhere-opensource-src-4.7.3/config.log"
including the output of the failure of your make command. Also, it might be
a good idea to provide an overview of all packages installed on your system
(e.g. an `ls /var/db/pkg`).

Please, fix.

-- 
Steve