Use CMAKE_CURRENT_BINARY_DIR instead of CMAKE_BINARY_DIR
This allows for building with cmake's add_subdirectory() function.main
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@ -1,4 +1,4 @@
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if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
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if(${CMAKE_CURRENT_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_BINARY_DIR})
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message(FATAL_ERROR "Prevented in-tree built. Please create a build directory outside of the SDL source code and call cmake from there")
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endif()
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