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