diff -up chromium-50.0.2661.86/third_party/boringssl/boringssl.gyp.addrfix chromium-50.0.2661.86/third_party/boringssl/boringssl.gyp
--- chromium-50.0.2661.86/third_party/boringssl/boringssl.gyp.addrfix	2016-04-27 13:26:38.483282586 -0400
+++ chromium-50.0.2661.86/third_party/boringssl/boringssl.gyp	2016-04-27 13:28:19.843065230 -0400
@@ -18,6 +18,7 @@
         'BORINGSSL_IMPLEMENTATION',
         'BORINGSSL_NO_STATIC_INITIALIZER',
         'OPENSSL_SMALL',
+	'_POSIX_C_SOURCE=200112L',
       ],
       'dependencies': [ 'boringssl_asm' ],
       # TODO(davidben): Fix size_t truncations in BoringSSL.