I used following cmake file:
project(context2d)

FIND_PACKAGE(Qt4 REQUIRED)

SET( QT_USE_QTSCRIPT TRUE )

add_definitions(-DQT_NO_SCRIPTTOOLS)

SET(context2d_SRCS
main.cpp
context2d.cpp
domimage.cpp
environment.cpp
qcontext2dcanvas.cpp
window.cpp
)

SET(context2d_HEADERS
context2d.h
domimage.h
environment.h
qcontext2dcanvas.h
window.h
)

QT4_WRAP_CPP( context2d_HEADERS_MOC ${context2d_HEADERS} )

SET(context2d_RESOURCES context2d.qrc)

QT4_ADD_RESOURCES(context2d_RESOURCES_RCC ${context2d_RESOURCES})

INCLUDE(${QT_USE_FILE})
ADD_DEFINITIONS(${QT_DEFINITIONS})

ADD_EXECUTABLE(context2d ${context2d_SRCS}
${context2d_RESOURCES_RCC}
${context2d_HEADERS_MOC} )

TARGET_LINK_LIBRARIES(context2d ${QT_LIBRARIES})

It builds but I had to add -DQT_NO_SCRIPTTOOLS. Which means no Run in Debugger. How to enable Qt scripttools in cmake?