1 files changed, 9 insertions, 1 deletions

diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
index f2ff57f..ed7320a 100644
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@@ -20,7 +20,15 @@ case $host_os in
                 # weak seed on failure to open /dev/random, based on latest
                 # public source:
                 # http://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c
-                USE_BUILTIN_ARC4RANDOM=yes
+                AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <sys/random.h>
+                       ]], [[
+char buf[1]; getentropy(buf, 1);
+                                           ]])],
+                       [ USE_BUILTIN_ARC4RANDOM=no ],
+                       [ USE_BUILTIN_ARC4RANDOM=yes ]
+                )
                 # Not available on iOS
                 AC_CHECK_HEADER([arpa/telnet.h], [], [BUILD_NC=no])
                 ;;