how to compile qtopia 2.2 with thread support

The document only says add '-thread' when config qt2
the configure info is shown as following
"
Using the following configurations:
QPE_CFG="-edition phone -displaysize 176x208 -no-qtopiadesktop -release -platform 'linux-g++' -xplatform 'linux-generic-g++'"
QTE_CFG="-embedded -no-xft -qconfig qpe -qvfb -depths 4,8,16,32 -keypad-mode -system-jpeg -gif -release -platform 'linux-g++' -xplatform 'linux-generic-g++'"
QT2_CFG="-thread -platform 'linux-g++'"
DQT_CFG="-thread -qt-gif -fast -platform 'linux-g++'"
"
but it seems do nothing, qtopia dose not support thread when I compile and install completely