QtWebKit Build Failure

Project MESSAGE: Running perl /home/rsadhu/work/devWebKit/qtWebKit/Tools/qmake/syncqt-4.8 -outdir /home/rsadhu/work/devWebKit/qtWebKit/WebKitBuild/Debug -separate-module QtWebKit:/home/rsadhu/work/devWebKit/qtWebKit/Source:WebKit/qt/Api
syncqt: QTDIR not defined at /home/rsadhu/work/devWebKit/qtWebKit/Tools/qmake/syncqt-4.8 line 25.
Project ERROR: Failed to run perl /home/rsadhu/work/devWebKit/qtWebKit/Tools/qmake/syncqt-4.8 -outdir /home/rsadhu/work/devWebKit/qtWebKit/WebKitBuild/Debug -separate-module QtWebKit:/home/rsadhu/work/devWebKit/qtWebKit/Source:WebKit/qt/Api
make[2]: *** [sub-api-pri-qmake_all] Error 2
make[2]: Leaving directory `/home/rsadhu/work/devWebKit/qtWebKit/WebKitBuild/Debug/Source'
make[1]: *** [sub-Source-QtWebKit-pro-recursive_qmake] Error 2
make[1]: Leaving directory `/home/rsadhu/work/devWebKit/qtWebKit/WebKitBuild/Debug'
make: *** [incremental] Error 2