+# if defined(__linux) && !defined(__ANDROID__)
+# ifndef DEVRANDOM_WAIT
+# define DEVRANDOM_WAIT "/dev/random"
+# endif
+/*
+ * Linux kernels 4.8 and later changes how their random device works and there
+ * is no reliable way to tell that /dev/urandom has been seeded -- getentropy(2)
+ * should be used instead.
+ */
+# ifndef DEVRANDOM_SAFE_KERNEL
+# define DEVRANDOM_SAFE_KERNEL 4, 8
+# endif
+/*
+ * Some operating systems do not permit select(2) on their random devices,
+ * defining this to zero will force the used of read(2) to extract one byte
+ * from /dev/random.
+ */
+# ifndef DEVRANDM_WAIT_USE_SELECT
+# define DEVRANDM_WAIT_USE_SELECT 1
+# endif
+/*
+ * Define the shared memory identifier used to indicate if the operating
+ * system has properly seeded the DEVRANDOM source.
+ */
+# ifndef OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID
+# define OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID 114
+# endif
+
+# endif