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	# Various system libraries			# Various system libraries
	check_symbol_exists(strnlen "string.h" HAVE_DECL_STRNLEN)			check_symbol_exists(strnlen "string.h" HAVE_DECL_STRNLEN)
	check_symbol_exists(daemon "unistd.h" HAVE_DECL_DAEMON)			check_symbol_exists(daemon "unistd.h" HAVE_DECL_DAEMON)

	# Check for ways to obtain entropy			# Check for ways to obtain entropy
	check_symbol_exists(getentropy "unistd.h" HAVE_GETENTROPY)			check_symbol_exists(getentropy "unistd.h" HAVE_GETENTROPY)
	check_symbol_exists(getentropy "sys/random.h" HAVE_GETENTROPY_RAND)			check_symbol_exists(getentropy "sys/random.h" HAVE_GETENTROPY_RAND)

				# getifaddrs and freeifaddrs may be unavailable with some Android versions
				check_symbol_exists(getifaddrs "sys/types.h;ifaddrs.h" HAVE_DECL_GETIFADDRS)
				check_symbol_exists(freeifaddrs "sys/types.h;ifaddrs.h" HAVE_DECL_FREEIFADDRS)

	check_cxx_source_compiles("			check_cxx_source_compiles("
	#include <unistd.h> /* for syscall */			#include <unistd.h> /* for syscall */
	#include <sys/syscall.h> /* for SYS_getrandom */			#include <sys/syscall.h> /* for SYS_getrandom */
	int main() {			int main() {
	syscall(SYS_getrandom, nullptr, 0, 0);			syscall(SYS_getrandom, nullptr, 0, 0);
	return 0;			return 0;
	}			}
	" HAVE_SYS_GETRANDOM)			" HAVE_SYS_GETRANDOM)
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