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[Aomandeyi <>]

the CMakeLists.txt is offered by offical examples as follow, i didn't modify
it 
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# Created by the script cgal_create_cmake_script
# This is the CMake script for compiling a CGAL application.

cmake_minimum_required(VERSION 3.1...3.15)
project(Triangulation_2_Examples)

if(NOT POLICY CMP0070 AND POLICY CMP0053)
  # Only set CMP0053 to OLD with CMake<3.10, otherwise there is a warning.
  cmake_policy(SET CMP0053 OLD)
endif()

if(POLICY CMP0071)
  cmake_policy(SET CMP0071 NEW)
endif()

find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt5)

if(CGAL_Qt5_FOUND)
  add_definitions(-DCGAL_USE_BASIC_VIEWER -DQT_NO_KEYWORDS)
endif()

# create a target per cppfile
file(
  GLOB cppfiles
  RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
  ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
foreach(cppfile ${cppfiles})
  create_single_source_cgal_program("${cppfile}")
endforeach()

if(CGAL_Qt5_FOUND)
  target_link_libraries(draw_triangulation_2 PUBLIC CGAL::CGAL_Qt5)
else()
  message(
    STATUS
      "NOTICE: The example draw_triangulation_2 requires Qt and will not be
compiled."
  )
endif()
-----------------------------------------------------------------------



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