I cannot enable ICU library support with Qt-5.0.2

I’ve been trying to build Qt-5.0.2 with qtwebkit enabled. Webkit needs ICU library support, so I’ve installed the latest version of ICU in /usr/local. However, the qtbase/configure script won’t recognize it. It says “The ICU library support cannot be enabled.” when the -icu swith is turned on. By the default, the configure script doesn’t turn on the support. I set the PKG_CONFIG_PATH and the LD_LIBRARY_PATH correctly at the configuration. How can I build the Qt-5.0.2 with the ICU support enabled and build atwebkit? Regards,