diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 2dac3f9..aa16c50 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -28,6 +28,10 @@
 #ifndef SYS_CDEFS_H
 #define SYS_CDEFS_H
 
+#ifdef __APPLE__
+#include_next <sys/cdefs.h>
+#else
+
 #include <features.h>
 
 #ifdef __GLIBC__
@@ -53,4 +57,6 @@
 
 #define __unreachable() __builtin_unreachable()
 
+#endif
+
 #endif
diff --git a/include/string.h b/include/string.h
index 68108f6..9707bcd 100644
--- a/include/string.h
+++ b/include/string.h
@@ -38,7 +38,9 @@
 extern "C" {
 #endif
 
+#ifndef __APPLE__
 void strmode(mode_t, char *);
+#endif
 #ifndef HAVE_STRLCPY
 size_t strlcpy(char *d, const char *s, size_t n);
 #endif