--- cryptography-2.2.2/src/_cffi_src/openssl/src/osrandom_engine.h	2018-03-27 15:12:05.000000000 +0100
+++ cryptography-2.2.2-patch/src/_cffi_src/openssl/src/osrandom_engine.h	2018-06-02 05:06:04.000000000 +0100
@@ -11,13 +11,6 @@
     #include <sys/syscall.h>
   #endif
 
-  #ifdef __APPLE__
-    #include <sys/random.h>
-    /* To support weak linking we need to declare this as a weak import even if
-     * it's not present in sys/random (e.g. macOS < 10.12). */
-    extern int getentropy(void *buffer, size_t size) __attribute((weak_import));
-  #endif
-
   #ifdef __linux__
     /* for SYS_getrandom */
     #include <sys/syscall.h>