project(EigenDemos) add_custom_target(demos) if(NOT EIGEN_TEST_NOQT) find_package(Qt4) if(QT4_FOUND) add_subdirectory(mandelbrot) add_subdirectory(opengl) else(QT4_FOUND) message(STATUS "Qt4 not found, so disabling the mandelbrot and opengl demos") endif(QT4_FOUND) endif()