blob: 7df9a0754c7c638e3757ba21a7f5896246bcf13a (
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--- 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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