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	" HAVE_FUNC_ATTRIBUTE_VISIBILITY)			" HAVE_FUNC_ATTRIBUTE_VISIBILITY)

	check_cxx_source_compiles("			check_cxx_source_compiles("
	__declspec(dllexport) int main() {			__declspec(dllexport) int main() {
	return 0;			return 0;
	}			}
	" HAVE_FUNC_ATTRIBUTE_DLLEXPORT)			" HAVE_FUNC_ATTRIBUTE_DLLEXPORT)

				check_cxx_source_compiles("
				// same as in src/util/system.cpp
				#ifdef __linux__
				#ifdef _POSIX_C_SOURCE
				#undef _POSIX_C_SOURCE
				#endif
				#define _POSIX_C_SOURCE 200112L
				#endif // __linux__
				#include <fcntl.h>
				int main() {
				return posix_fallocate(0, 0, 0);
				}
				" HAVE_POSIX_FALLOCATE)

	#__fdelt_chk's params and return type have changed from long unsigned int to			#__fdelt_chk's params and return type have changed from long unsigned int to
	# long int. See which one is present here.			# long int. See which one is present here.
	include(CheckPrototypeDefinition)			include(CheckPrototypeDefinition)

	set(CMAKE_REQUIRED_DEFINITIONS -D_FORTIFY_SOURCE=2)			set(CMAKE_REQUIRED_DEFINITIONS -D_FORTIFY_SOURCE=2)
	# Without some optimization the compiler won't detect the prototype conflict			# Without some optimization the compiler won't detect the prototype conflict
	# and always succeed to build.			# and always succeed to build.
	set(CMAKE_REQUIRED_FLAGS -O2)			set(CMAKE_REQUIRED_FLAGS -O2)
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