VirtualBox-2.1.4_OSE on redhat

[spartiat]

hello,

I'm trying to install VBox on my redhat 5.1

Checking for Qt3:
Qt3 not found at "/usr/qt/3 /usr/lib/qt3 /usr/lib/qt-3.3 /usr/share/qt3 /usr/lib64/qt-3.3 /usr/X11R6 /usr/lib/qt" or Qt3 headers not found
Check the file /home/icp/Desktop/VirtualBox-2.1.4_OSE/configure.log for detailed error information.

AND configure.log

#include <cstdio>
#include <qglobal.h>
extern "C" int main(void)
{
printf("found version %s", QT_VERSION_STR);
#if QT_VERSION >= 0x030305
printf(", OK.\n");
return 0;
#elif QT_VERSION >= 0x030300
printf("\n ** WARNING: QT < 3.3.5 has known problems!\n");
#else
printf(", expected version 3.3.0 or higher\n");
return 1;
#endif
}
using the following command line:
g++ -O -Wall -o .tmp_out .tmp_src.cc -I/usr/lib/qt/include -L/usr/lib/qt/lib -lqt-mt -lpthread
.tmp_src.cc:2:21: error: qglobal.h: No such file or directory
.tmp_src.cc: In function 'int main()':
.tmp_src.cc:5: error: 'QT_VERSION_STR' was not declared in this scope

ANY Help Please !!!!!