I might have narrowed the focus for kdebindings. :)

In my build script, after I run libtools to auto-generate the makefiles, and before I run configure, I copied the original stock 3.5.10 python/sip/sipgen directory files over the svn version. (Remember that during my builds my svn version of the package sources are in tmpfs.)

By golly the build did not fail at the same point.

Comparing the 3.5.10 and svn python/sip/sipgen directories reveals the svn version referencing TQT interface objects. I'm guessing the previous build failures have something to do with that.

My on-the-fly replacement of the files removed the TQT interface references.

Based upon the many past fixes I've seen, I suspect the solution might be some <include tqt*whatever.h. statements.

The previous failures always took place in lexer.l. I do not notice any <include tqt*whatever.h> statements. That might be the only file that needs appropriate include statements, but also might mean the compile only stopped at that point and other files in that same directory need similar include statements.

The build eventually failed:

==========================================
make[4]: Entering directory `/dev/shm/kdebindings/python/pykde/kdeui'
g++ -c -Wno-deprecated-declarations -pipe -fPIC -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -I. -I../extra/kde353 -I/usr/include -I/dev/shm/kdebindings/python/sip/siplib -I/usr/include/python2.5 -I/usr/lib/qt/mkspecs/default -I/usr/lib/qt//include -I/usr/X11R6/include -o sipkdeuiKInputDialog.o sipkdeuiKInputDialog.cpp
In file included from sip/kdeui/kinputdialog.sip:32,
                 from sipkdeuiKInputDialog.cpp:25:
/usr/include/kinputdialog.h:58: error: 'QValidator' has not been declared
/usr/include/kinputdialog.h:119: error: 'QValidator' has not been declared
/usr/include/kinputdialog.h:132: error: 'QValidator' has not been declared
sipkdeuiKInputDialog.cpp: In function 'PyObject* meth_KInputDialog_getText(PyObject*, PyObject*)':
sipkdeuiKInputDialog.cpp:116: error: no matching function for call to 'KInputDialog::getText(const QString&, const QString&, const QString&, bool*, QWidget*&, const char*&, QValidator*&, const QString&)'
/usr/include/kinputdialog.h:120: note: candidates are: static QString KInputDialog::getText(const QString&, const QString&, const QString&, bool*, QWidget*, const char*, int*, const QString&)
sipkdeuiKInputDialog.cpp: In function 'PyObject* meth_KInputDialog_text(PyObject*, PyObject*)':
sipkdeuiKInputDialog.cpp:163: error: no matching function for call to 'KInputDialog::text(const QString&, const QString&, const QString&, bool*, QWidget*&, const char*&, QValidator*&, const QString&, const QString&)'
/usr/include/kinputdialog.h:134: note: candidates are: static QString KInputDialog::text(const QString&, const QString&, const QString&, bool*, QWidget*, const char*, int*, const QString&, const QString&)
make[4]: *** [sipkdeuiKInputDialog.o] Error 1
make[4]: Leaving directory `/dev/shm/kdebindings/python/pykde/kdeui'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/dev/shm/kdebindings/python/pykde'
make[2]: *** [build_pyqt_pykde] Error 2
make[2]: Leaving directory `/dev/shm/kdebindings/python'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/dev/shm/kdebindings'
make: *** [all] Error 2
==========================================

I believe those errors are related to my copying the original sipgen files. The build ran for about 26 minutes before failing, unlike the previous 3 and half minutes. Thus, I'm encouraged we might now be on the right track of solving this problem.

I hope that helps!