I use slackware 10.0 preconfigured with KDE, but I want to test how BlackBox works, so I downloaded the latest BlackBox version.
The ./configure process reports no errors and is allright, but while make process the following error shows up and halts the whole process:

Window.cc: In member function `bool BlackboxWindow::setInputFocus()':
Window.cc:1396: error: `assert' undeclared (first use this function)
Window.cc:1396: error: (Each undeclared identifier is reported only once for
each function it appears in.)
Window.cc: In member function `void
BlackboxWindow::constrain(BlackboxWindow::Corner, unsigned int*, unsigned
int*)':
Window.cc:3234: error: `assert' undeclared (first use this function)
make[2]: *** [Window.o] Error 1



Please help me!

OK, no need to bother anymore!
I found a lag in window.cc source code.
When adding #include <assert.h> into window.cc file the make process goes without errors and eveything is fine.

Thanks anyway!