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if("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU
OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Intel
OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Clang
OR "${CMAKE_CXX_COMPILER_ID}" MATCHES XL
OR "${CMAKE_CXX_COMPILER_ID}" MATCHES SunPro)
find_package(PNG)
# the test program links against the png lib, so test first whether it exists
if(PNG_FOUND AND UNIX AND "${CMAKE_GENERATOR}" MATCHES "Makefile")
get_target_property(cmakeExecutable cmake LOCATION)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Makefile.in ${CMAKE_CURRENT_BINARY_DIR}/ConfMakefile @ONLY)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/main.cpp ${CMAKE_CURRENT_BINARY_DIR}/main.cpp COPYONLY)
add_test(FindPackageModeMakefileTest ${CMAKE_MAKE_PROGRAM} -f ${CMAKE_CURRENT_BINARY_DIR}/ConfMakefile )
endif()
endif()
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