--- a/configure.ac
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+++ b/configure.ac
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@@ -425,7 +425,8 @@ AC_CHECK_DECL([mach_absolute_time],
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AC_CHECK_DECLS([__builtin_ctz])
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AC_CHECK_DECLS([ffs], [], [],
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- [[#include <strings.h>]])
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+ [[#define _GNU_SOURCE
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+#include <strings.h>]])
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AC_CHECK_DECLS([be64toh, betoh64, bswap64, __builtin_bswap64], [], [],
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[[#if defined(HAVE_ENDIAN_H)
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