python-qt4 FTBFS in edgy, broken QT environment?

python-qt4 fails to build in edgy (very recently, as it worked a week ago...) with the following:

Determining the layout of your Qt installation...
This is the GPL version of PyQt 4.0.1 (licensed under the GNU General Public
License) for Python 2.4.4c1 on linux2.

Type 'L' to view the license.
Type 'yes' to accept the terms of the license.
Type 'no' to decline the terms of the license.

Do you accept the terms of the license? Checking to see if the QtGui module should be built...
An internal error occured. Please report all the output from the program,
including the following traceback, to <email address hidden>.

Traceback (most recent call last):
  File "../configure.py", line 1162, in ?
    main(sys.argv)
  File "../configure.py", line 1129, in main
    pyqt.check_modules()
  File "../configure.py", line 143, in check_modules
    check_module("QtGui", "qwidget.h", "QWidget()")
  File "../configure.py", line 424, in check_module
    if check_class(incfile, ctor, mname):
  File "../configure.py", line 451, in check_class
    return compile_qt_program(cfgtest, mname)
  File "../configure.py", line 381, in compile_qt_program
    exe, build = makefile.build_command(name)
  File "/usr/lib/python2.4/site-packages/sipconfig.py", line 1659, in build_command
    build.append(self.required_string("CXX"))
  File "/usr/lib/python2.4/site-packages/sipconfig.py", line 793, in required_string
    raise ValueError, "\"%s\" must have a non-empty value" % name
ValueError: "CXX" must have a non-empty value
test ! -e failed-stamp && touch configure-stamp
make: *** [configure-stamp] Error 1