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diff --git a/lib/openssl/crypto/async/arch/async_posix.c b/lib/openssl/crypto/async/arch/async_posix.c
new file mode 100644
index 0000000..02c342d
--- /dev/null
+++ b/lib/openssl/crypto/async/arch/async_posix.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* This must be the first #include file */
+#include "../async_locl.h"
+
+#ifdef ASYNC_POSIX
+
+# include <stddef.h>
+# include <unistd.h>
+
+#define STACKSIZE       32768
+
+int ASYNC_is_capable(void)
+{
+    ucontext_t ctx;
+
+    /*
+     * Some platforms provide getcontext() but it does not work (notably
+     * MacOSX PPC64). Check for a working getcontext();
+     */
+    return getcontext(&ctx) == 0;
+}
+
+void async_local_cleanup(void)
+{
+}
+
+int async_fibre_makecontext(async_fibre *fibre)
+{
+    fibre->env_init = 0;
+    if (getcontext(&fibre->fibre) == 0) {
+        fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);
+        if (fibre->fibre.uc_stack.ss_sp != NULL) {
+            fibre->fibre.uc_stack.ss_size = STACKSIZE;
+            fibre->fibre.uc_link = NULL;
+            makecontext(&fibre->fibre, async_start_func, 0);
+            return 1;
+        }
+    } else {
+        fibre->fibre.uc_stack.ss_sp = NULL;
+    }
+    return 0;
+}
+
+void async_fibre_free(async_fibre *fibre)
+{
+    OPENSSL_free(fibre->fibre.uc_stack.ss_sp);
+    fibre->fibre.uc_stack.ss_sp = NULL;
+}
+
+#endif