This patch enables using libfdt's strlen() implementation.

diff --git i/libfdt/libfdt_env.h w/libfdt/libfdt_env.h
index 73b6d40..3a2d38c 100644
--- i/libfdt/libfdt_env.h
+++ w/libfdt/libfdt_env.h
@@ -66,13 +66,6 @@ static inline fdt64_t cpu_to_fdt64(uint64_t x)
 #undef CPU_TO_FDT16
 #undef EXTRACT_BYTE

-#ifdef __APPLE__
-#include <AvailabilityMacros.h>
-
-/* strnlen() is not available on Mac OS < 10.7 */
-# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
-                                         MAC_OS_X_VERSION_10_7)
-
 #define strnlen fdt_strnlen

 /*
@@ -88,9 +81,4 @@ static inline size_t fdt_strnlen(const char *string, size_t max_count)
     return p ? p - string : max_count;
 }

-#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
-          MAC_OS_X_VERSION_10_7) */
-
-#endif /* __APPLE__ */
-
 #endif /* LIBFDT_ENV_H */