LinuxQuestions.org - cant install opebox, errors help

Code:
Making all in src

make[2]: Entering directory `/home/swooshonln/openbox-2.2.3/src'

if g++ -DHAVE_CONFIG_H -I. -I. -I..  -DNDEBUG -I/usr/X11R6/include -I/usr/inclu

de/freetype2 -I/usr/include/freetype2/config -DLOCALEPATH=\"/usr/local/share/ope

nbox/nls\" -DBUTTONSDIR=\"/usr/local/share/openbox/buttons\" -DDEFAULTMENU=\"/us

r/local/share/openbox/menu\" -DDEFAULTSTYLE=\"/usr/local/share/openbox/styles/mb

dtex\"  -g -O2  -I/usr/X11R6/include -Wall -W -MT Configuration.o -MD -MP -MF ".

deps/Configuration.Tpo" \

  -c -o Configuration.o `test -f 'Configuration.cc' || echo './'`Configuration.c

c; \

then mv ".deps/Configuration.Tpo" ".deps/Configuration.Po"; \

else rm -f ".deps/Configuration.Tpo"; exit 1; \

fi

Configuration.cc: In member function `void Configuration::save()':

Configuration.cc:77: error: `assert' undeclared (first use this function)

Configuration.cc:77: error: (Each undeclared identifier is reported only once

  for each function it appears in.)

Configuration.cc: In member function `void Configuration::create()':

Configuration.cc:104: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `void Configuration::setValue(const

  std::string&, bool)':

Configuration.cc:108: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `void Configuration::setValue(const

  std::string&, long unsigned int)':

Configuration.cc:120: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `void Configuration::setValue(const

  std::string&, long int)':

Configuration.cc:131: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `void Configuration::setValue(const

  std::string&, const char*)':

Configuration.cc:142: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `void Configuration::setValue(const

  std::string&, const std::string&)':

Configuration.cc:154: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `bool Configuration::getValue(const

  std::string&, bool&) const':

Configuration.cc:165: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `bool Configuration::getValue(const

  std::string&, long int&) const':

Configuration.cc:183: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `bool Configuration::getValue(const

  std::string&, long unsigned int&) const':

Configuration.cc:200: error: `assert' undeclared (first use this function)

Configuration.cc: In member function `bool Configuration::getValue(const

  std::string&, std::string&) const':

Configuration.cc:218: error: `assert' undeclared (first use this function)

make[2]: *** [Configuration.o] Error 1

make[2]: Leaving directory `/home/swooshonln/openbox-2.2.3/src'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/home/swooshonln/openbox-2.2.3'

make: *** [all] Error 2

root@slacker:/home/swooshonln/openbox-2.2.3#
./configure and "make" run sucessfully. however, when I run 'make install' i get those errors at the end. Any ideas? I have downloaed all the necessary deps listed on the Freshmeat website. (I am running as root)