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-rw-r--r--arch/arm/armfeature.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/armfeature.c b/arch/arm/armfeature.c
index bef9b29..978c987 100644
--- a/arch/arm/armfeature.c
+++ b/arch/arm/armfeature.c
@@ -11,6 +11,9 @@
# define ID_AA64ISAR0_CRC32_VAL ID_AA64ISAR0_CRC32
# endif
#elif defined(__APPLE__)
+# if !defined(_DARWIN_C_SOURCE)
+# define _DARWIN_C_SOURCE /* enable types aliases (eg u_int) */
+# endif
# include <sys/sysctl.h>
#elif defined(_WIN32)
# include <winapifamily.h>